yashsingh1/xdaforums huggingface dataset:
[One (M8) Q&A, Help & Troubleshooting] Mr Hofs:
Like in ALL "help get me back to stock" threads the fastboot command "fastboot getvar all" is asked.

Same goes here....then we know pretty much all !

And you are busy with your issue here

http://xdaforums.com/showthread.php?t=3193187

Don't start cross posting, it's annoying and confusing ! And the same guy is helping there so not sure why to post here anyway..... You got the info there already. He doesn't know anything more here than he already knows in the other thread !
[One (M8) Q&A, Help & Troubleshooting] Freaksterz:
Hi, Your upload of 4.19.707.2 TWRP recovery link doesn't work.

Thanks for your effort and keep up the good work!
[One (M8) Q&A, Help & Troubleshooting] Rajaasim1980:
Thanks alot man. It sorted out my problem..finally got it sim unlock with code

..now looking way to root it again with custom recovery :D
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Great :good::good:

To root, install latest TWRP then flash SuperSu zip in recovery

Download SuperSu : http://download.chainfire.eu/supersu

But .. when your device S-On, root is not 100% functional like you can't uninstall unwanted apps and so on because the stock kernel is write protection enabled.

Install a custom kernel for example ElementalX to get full write access... or install any custom ROM that you like.
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Link is correct ...

If the site is blocked by your ISP, use VPN to download.
[One (M8) Q&A, Help & Troubleshooting] Freaksterz:
Oops, Sorry I meant the TWRP backup.
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Thanks ... fixed.
[One (M8) Q&A, Help & Troubleshooting] a99mimon:
Hi ckpv5,

Thanks for a great, informative post.

I'm a total newbie to Android having just switched from an iphone. I got a HTC One M8, and everything has been working beautifully until I tried to update to Lollipop, when halfway through it stalled and just got stuck in an infinite boot loop. Apparently HTC support want nothing to do with it since the IMEI signals it was a "demo model"

Anyway, my only choice was to get involved myself - I've since successfully unlocked bootloader, and have been following your steps. Installed TWRP 2.8.3.0, since my OS version on bootloader says "3.28.401.9"

However, going through your steps I don't know which TWRP backup to download (in your posts #2 and #3). My HBOOT says 3.19.0.0000, OS is 3.28.401.9, and the CID gives me "11111111", and MID is "0P6B10000".

Please help!!

Thanks so much

Mark
[One (M8) Q&A, Help & Troubleshooting] Likkleskip:
I already have the lollipop update and when I boot it I have ota's ready to install.. it's rooted tho.. will they still download and install ?

---------- Post added at 10:28 PM ---------- Previous post was at 10:27 PM ----------

It's OK ☺ I understand
[One (M8) Q&A, Help & Troubleshooting] jafalex:
Hello everyone! I'm using a custom rom now but I want to back stock one. I checked my device's info but I still don't know what file I must download :( Here's the info:

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-main: 4.16.709.9

(bootloader) cidnum: HTC__621

I'm on Android 5.0.1 now but want to nandroid restore Android 6. In this case, what do I do? I must download Android 5 nandroid backup or Android 6 nandroid backup? If I must download Android 5, must I check OTA update manually after flashing?
[One (M8) Q&A, Help & Troubleshooting] Einwod:
Go to the very first post and start reading. It's simple. All you need is in the first 4 posts. Read, read and read again.
[One (M8) Q&A, Help & Troubleshooting] jafalex:
I don't understand that must my firmware version match with the file which I download? Mine is 4.16.709.9 now. So, I can download only 4.16.709.9 or I can also download this one 6.20.709.2?
[One (M8) Q&A, Help & Troubleshooting] Einwod:
You must download the same and you do not have the new firmware compatible with the 6.20.709.2. That will come when you get the OTA update which will in turn update your firmware. So both files need to be 4.16.709.9.
[One (M8) Q&A, Help & Troubleshooting] jafalex:
Thank you! So, after I flash 4.16.709.9 I must update my OS via OTA?
[One (M8) Q&A, Help & Troubleshooting] Einwod:
Once you are back to stock if the system does not find the OTA you can check in settings.
[One (M8) Q&A, Help & Troubleshooting] s-android:
hi

i need 6.16.401.1 twrp backup for m8 dual sim

but in 1st post i cant find it

i found 6.16.401.101

is this work?

---------- Post added at 01:22 PM ---------- Previous post was at 01:13 PM ----------

i flash the stock recovey 6.16.401.101

but is shows :eek:

so

in this situation

the backup will not work also
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
There's no info on 6.16.401.1 on the WWW

post fastboot getvar all result minus serial & imei no.
[One (M8) Q&A, Help & Troubleshooting] s-android:
(bootloader) version: 0.5

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-baseband: 1.24.30336021.13G

(bootloader) version-cpld: None

(bootloader) version-microp: None

(bootloader) version-main:

(bootloader) version-misc: PVT SHIP S-ON

(bootloader) serialno:

(bootloader) imei:

(bootloader) imei2:

(bootloader) meid: 00000000000000

(bootloader) product: m8_dugl

(bootloader) platform: hTCBmsm8974

(bootloader) modelid:

(bootloader) cidnum: HTC__J15

(bootloader) battery-status: good

(bootloader) battery-voltage: 0mV

(bootloader) partition-layout: Generic

(bootloader) security: on

(bootloader) build-mode: SHIP

(bootloader) boot-mode: FASTBOOT

(bootloader) commitno-bootloader: 205bdca3

(bootloader) hbootpreupdate: 11

(bootloader) gencheckpt: 0

all: Done!
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Remove your serial no ...

You can try restore 4.30.401.16 backup & recovery and redo OTA.

It seems that 0P6B68000 got split up after 4.30.401.18
[One (M8) Q&A, Help & Troubleshooting] s-android:
tnx.

how about root?

i flash some patch...but it seems not root completly
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
How to root does not belong to this thread.

In fact your other thread never mentioned anything about rooting. If rooting is the problem that your device doesn't boot, you should have mentioned that in your thread.

And I believe that's an easy fix for that - use SuperSU 2.67 - http://xdaforums.com/showpost.php?p=64161125&postcount=3

So it's your choice, to use the backup to make it up and running (make a backup of what you currently have) or to fix not booting problem due to wrong rooting process, and for this .. continue in your own thread and post the actual thing that you did before the problem. Someone will be able to help you.
[One (M8) Q&A, Help & Troubleshooting] redpoint73:
I just said you needed the

stock

ROM, that means

no root

(

never

rooted, unrooting the current ROM won't work). You'll need to restore the stock TWRP backup for the version number I suggested before to get back to the never-rooted ROM. Then restore matching stock recovery, then OTA.
[One (M8) Q&A, Help & Troubleshooting] eeaiou:
something went wrong...

Hi,

I wanted to upgrade on MM with this M8:

(bootloader) version: 0.5

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-baseband: 1.24.21331147A1.09G

(bootloader) version-cpld: None

(bootloader) version-microp: None

(bootloader) version-main: 4.18.708.12

(bootloader) version-misc: PVT SHIP S-ON

(bootloader) imei2: Not Support

(bootloader) meid: 00000000000000

(bootloader) product: m8_ul

(bootloader) platform: hTCBmsm8974

(bootloader) modelid: 0P6B63000

(bootloader) cidnum: HTC__622

I followed the tutorial, TWRP back up 2.11.708.2 then the proper recovery.

Everything went good.

OTA to 4.4.4. and then it got stuck at reboot.

I certainly missed something with the recovery as I can’t reboot on recovery.

Now I can only enter the bootloader.

Should I follow this ?

Thanks
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Why did you restore such old 2.11.708.2 backup ?

Install TWRP 2.8.7.0 then restore 4.18.708.12 backup and install 4.18.702.18 stock recovery then do OTA to Marshmallow.

The other thread is not for your device version.
[One (M8) Q&A, Help & Troubleshooting] redpoint73:
If an RUU exists for your version (708) then yes that can be used to restore/update. But the one discussed in your link (401) won't work.
[One (M8) Q&A, Help & Troubleshooting] eeaiou:
Ok, got that. As soon as I can, I'll install 4.18.708.12 back up and 4.18.702.18 stock recovery.

I don't know why I went for this version. Was pretty stupid anyway...

Thanks!
[One (M8) Q&A, Help & Troubleshooting] Likkleskip:
Thank you guys for everything I'm downloading now
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Thanks for the backup ..

Added to post #3
[One (M8) Q&A, Help & Troubleshooting] gaddy-:
uhm.. ATM I'm STOCK with android 6 but I don't like it, so I want to come back to the previous version.

Just to be sure:

. first I need to s-off

. AFTER flash the correct nandroid backup from the first post, I need to flash the firmware of 4.16.401.10 or I dont' need it?

Thx in advance
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
You can just restore 4.16.401.10 backup, that's enough. No need to spend USD25 to S-Off.

If you want to downgrade hboot, radio & etc, then you need S-Off. After S-Off, run 4.16.401.10 RUU
[One (M8) Q&A, Help & Troubleshooting] gaddy-:
to install twrp I need an unlocked bootloader, am I right? since I am stock I need to unlock first through htcdev or even through soff..

is there something I'm missing?
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Unlock bootloader thru htcdev

S-Off (optional)

Install TWRP

Restore 4.16.401.10 backup

Or

Unlock bootloader thru htcdev

S-Off (mandatory)

Run 4.16.401.10 RUU
[One (M8) Q&A, Help & Troubleshooting] shaboobla:
CANADA TELUS_WWE_6.13.661.9

CID TELUS001

Firmware:

https://www.androidfilehost.com/?fid=24399994186368791

OTA:

https://www.androidfilehost.com/?fid=24399994186368800

Stock Recovery:

https://www.androidfilehost.com/?fid=24399994186368793

Stock TWRP Backup -Unzip first-

https://www.androidfilehost.com/?fid=24399994186369161
[One (M8) Q&A, Help & Troubleshooting] gaddy-:
thx :)
[One (M8) Q&A, Help & Troubleshooting] AaronTj:
hey when i try to flash it it just goes like fastboot is not recognised and when you mean by folder do you mean by making your own one?. Thats what i get when i try to flash it

---------- Post added at 02:25 PM ---------- Previous post was at 02:19 PM ----------

also when i have tried to use other abd and fast boot it just stays waiting for device.iam running viperone rom and theres like settings where it says on the notification bar :charging

file transfer

cd Installer

usb tethering

midi input

mirrorlink connection

iam not sure which one to click
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
How did you install TWRP 2.7.0.2 in the first place ?

Read this : http://xdaforums.com/showpost.php?p=64926362&postcount=4

on what you need .. adb/fastboot and HTC USB driver.

fastboot won't work on OS running, must be in fastboot/bootloader mode.
[One (M8) Q&A, Help & Troubleshooting] AaronTj:
HI i got it to work by typing "fastboot flash recovery RECOVERY.IMG" its now running 2.8.7.0 thanks

---------- Post added at 02:50 PM ---------- Previous post was at 02:47 PM ----------

also when i do the getvar all command i cant find version main and cidnum is VODAP21 i dont know which stock ruu to get
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
I don't expect you to know ....

Post here the fastboot getvar all result without serial & imei no. then we'll see
[One (M8) Q&A, Help & Troubleshooting] AaronTj:
version: 0.5

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-baseband: 1.26.21331147A1.16G

(bootloader) version-cpld: None

(bootloader) version-microp: None

(bootloader) version-main:

(bootloader) version-misc: PVT SHIP S-ON

(bootloader) serialno:

(bootloader) imei:

(bootloader) imei2: Not Support

(bootloader) meid: 00000000000000

(bootloader) product: m8_ul

(bootloader) platform: hTCBmsm8974

(bootloader) modelid: 0P6B11000

(bootloader) cidnum: VODAP021

(bootloader) battery-status: good

(bootloader) battery-voltage: 0mV

(bootloader) partition-layout: Generic

(bootloader) security: on

(bootloader) build-mode: SHIP

(bootloader) boot-mode: FASTBOOT

(bootloader) commitno-bootloader: ba1d7a63

(bootloader) hbootpreupdate: 11

(bootloader) gencheckpt: 0

yes i just removed the imei and seriel... i went to another xda post and found a back up for it but its for touch wiz. CID VODAP021

1.12.710.17 - CWM Philz touch
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
For hboot 3.19.0000 and baseband 1.26, you need to restore 4.20.710.9 backup then install 4.20.710.9 stock recovery then do OTA to the latest Marshmallow 6.12.710.4 (if you want to)

4.20.710.9 backup on post #2

4.20.710.9 recovery.img on post #4

Read post no.1 all the 14 steps to understand what you need to do and how to do.
[One (M8) Q&A, Help & Troubleshooting] AaronTj:
Hi iam sorry to create such a hassle iam new to this and iam i am lost on which post would i possibly get the backup from. Sorry.

Best regards Aaron
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Already stated :

4.20.710.9 backup on post #2

4.20.710.9 recovery.img on post #4

The best thing for you to do now .. go to post #1, post #2, post #3 and post #4 and read them
[One (M8) Q&A, Help & Troubleshooting] Einwod:
If only this post could be seen by everyone as soon as they come to the thread. How many people do not read the first posts, I wonder?
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
That's life on XDA :p
[One (M8) Q&A, Help & Troubleshooting] shaboobla:
Self quoting for visibility and so it can be added to the OP.
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Thanks .. added to post #3 for Marshmallow collection
[One (M8) Q&A, Help & Troubleshooting] AaronTj:
hey when i created the boot back up theres no serial.no. i go to sdcard/Twrp/backups and it instantly shows sh47wm0727. and when i open it just pops up another folder named 2016-02-05-17-41-2 after that i open again and it shows

boot.emmc.win

boot.emmc.win.md5

recovery.log

is this correct? iam currently downloading the .zip file.

if iam correct iam suppose to extract the zip file and do i just copy the files inside of the zip and paste it into the current boot backup
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Fisrt - you don't have to quote that whole post #2 to make a statement ... please remove that.

Second - remove that serial no. from your post - that's personal info

sh47xxxxxx is the serial no.

Extract the downloaded zip ... copy and paste all the files in the boot backup..

later when select restore - select 2016-02-05-17-41-2 folder in restore menu and follow the rest of the procedure as stated on post #1
[One (M8) Q&A, Help & Troubleshooting] newbie900:
Questions on unrooting HTC One M8(International)

Hi,

I'm really new to this root/unroot thing. A few months ago, I rooted my One M8 with custom recovery(TWRP + S-ON). I want to unroot my phone to receive the OTA Android 6.0 update. Will this method work for me? (hopefully I'm in the correct forum)
[One (M8) Q&A, Help & Troubleshooting] AaronTj:
Thanks iam all done now :)
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Post fastboot getvar all result without serial & imei no. then we'll see what you need to do
[One (M8) Q&A, Help & Troubleshooting] newbie900:
(bootloader) version: 0.5

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-baseband: 1.25.21331147A1.06G

(bootloader) version-cpld: None

(bootloader) version-microp: None

(bootloader) version-main: 4.19.707.4

(bootloader) version-misc: PVT SHIP S-ON

(bootloader) serialno:

(bootloader) imei:

(bootloader) imei2: Not Support

(bootloader) meid: 00000000000000

(bootloader) product: m8_ul

(bootloader) platform: hTCBmsm8974

(bootloader) modelid: 0P6B11000

(bootloader) cidnum: HTC__044

(bootloader) battery-status: good

(bootloader) battery-voltage: 0mV

(bootloader) partition-layout: Generic

(bootloader) security: on

(bootloader) build-mode: SHIP

(bootloader) boot-mode: FASTBOOT

(bootloader) commitno-bootloader: 28eb9285

(bootloader) hbootpreupdate: 11

(bootloader) gencheckpt: 0

all: Done!

finished. total time: 0.016s

C:\Users\User\Desktop\One_M8_All-In-One_Kit_v\data>
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
What you need to do :

1. read post #1 all the 14 steps to understand How-To

2. Install TWRP 2.8.7.0 or latest

3. Restore 4.19.707.4 backup (post #2)

4. Install 4.19.707.4 stock recovery.img (post #4)

5. reboot - check OTA and install OTA

6. done - your device should be updated to Marshmallow 6.14.707.1

If you decide to re-root, install TWRP 2.8.7.0 or latest, install SuperSU 2.67.

Never accept to install SuperSU when offered by TWRP (same goes for the above 6 steps)
[One (M8) Q&A, Help & Troubleshooting] newbie900:
Thank you for replying so quickly. I'll do exactly as is written.

---------- Post added at 12:44 PM ---------- Previous post was at 12:33 PM ----------

I'm sorry, but I'm not quite sure what step 5 means (in the original post). How do I boot to TWRP recovery?
[One (M8) Q&A, Help & Troubleshooting] Einwod:
If you do not know how to do it with key presses, then from the OS open a command prompt in your adb folder and type the following: adb reboot bootloader

When you get to the bootloader screen, use volume keys to go to recovery. Press power to confirm.

Basically if you do not know how to get to recovery, you shouldn't really be doing this by yourself.
[One (M8) Q&A, Help & Troubleshooting] LayzJay:
I initially unlocked my bootloader then before flashing TWRP permanently i loaded it with fastboot (fastboot boot recovery.img) and made a nandroid backup.

I've already flashed the nandroid backup i made prior to flashing TWRP and the ARHD revolution 53.1 ROM

I've just flashed the 6.12.61.4 recovery.img which was successful. thanks for the download..

If i boot into HBOOT my phone is still unlocked,

My question is, am i back to stock, can i now recieve OTA's again being unlocked?

Thanks, and nice guide...

(bootloader) version: 0.5

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-baseband: 1.29.214500021.12G

(bootloader) version-cpld: None

(bootloader) version-microp: None

(bootloader) version-main: 6.12.61.4

(bootloader) version-misc: PVT SHIP S-ON

(bootloader) serialno: ************

(bootloader) imei: ************

(bootloader) imei2: Not Support

(bootloader) meid: 00000000000000

(bootloader) product: m8_ul

(bootloader) platform: hTCBmsm8974

(bootloader) modelid: 0P6B10000

(bootloader) cidnum: ORANG001

(bootloader) battery-status: good

(bootloader) battery-voltage: 0mV

(bootloader) partition-layout: Generic

(bootloader) security: on

(bootloader) build-mode: SHIP

(bootloader) boot-mode: FASTBOOT

(bootloader) commitno-bootloader: 76df2b54

(bootloader) hbootpreupdate: 11

(bootloader) gencheckpt: 0
[One (M8) Q&A, Help & Troubleshooting] Einwod:
Yes you can receive OTA being unlocked, though you also need your stock nandroid backup too. You will not receive OTA info when on custom ROMs like ARHD 53.1. You have the latest Marshmallow and it's very doubtful if there will be any more major updates from HTC.
[One (M8) Q&A, Help & Troubleshooting] LayzJay:
Sorry I'm sure what you mean by you saying that I also need my stock nandriod backup..

As I mentioned I used the nandriod backup I made of my stock phone, right after I unlocked the bootloader..

So assuming I'm all back to stock..
[One (M8) Q&A, Help & Troubleshooting] Einwod:
If you restore that Nandroid you will be back to stock, yes.
[One (M8) Q&A, Help & Troubleshooting] sleepijs:
I'm trying to restore my phone back to stock, but my version-main var is empty?

Which TWRP and stock recovery should I download?

my getvar :

(bootloader) version: 0.5

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-baseband: 1.25.214500021.06G

(bootloader) version-cpld: None

(bootloader) version-microp: None

(bootloader) version-main:

(bootloader) version-misc: PVT SHIP S-ON

(bootloader) serialno:

(bootloader) imei:

(bootloader) imei2: Not Support

(bootloader) meid: 00000000000000

(bootloader) product: m8_ul

(bootloader) platform: hTCBmsm8974

(bootloader) modelid: 0P6B10000

(bootloader) cidnum: HTC__032

(bootloader) battery-status: good

(bootloader) battery-voltage: 0mV

(bootloader) partition-layout: Generic

(bootloader) security: on

(bootloader) build-mode: SHIP

(bootloader) boot-mode: FASTBOOT

(bootloader) commitno-bootloader: 3aa067db

(bootloader) hbootpreupdate: 11

(bootloader) gencheckpt: 0

Thanks in advance! :)
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
Restore to stock to OTA to Marshmallow ?

If yes ...

1. Install TWRP 2.8.7.0 or the latest (your current one is outdated I guess, that's why version-main is empty)

2. Restore 4.16.401.13 backup (post #2)

3. Install 4.16.401.13 stock recovery.img (post #4)

4. Reboot and OTA to 6.12.401.4
[One (M8) Q&A, Help & Troubleshooting] newbie900:
It's alright, I managed to do it anyway, and it works perfectly. I was actually confused about the terms used in the steps. Thanks, really appreciate your help.
[One (M8) Q&A, Help & Troubleshooting] xunholyx:
Sorry for the OT, but lol
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
:D:D

Only to some weird questions :p
[One (M8) Q&A, Help & Troubleshooting] Perth027:
I have recently unrooted my HTC One M8, because I felt like going back to stock firmware/ Sense UI having used CM for a while. I downloaded and restored from a nandroid backup for my device from this thread, and then unrooted it (installed stock recovery, re-locked bootloader). I bought this phone second hand, so already running CM 13, and there were no backups for the stock ROM.

But now I can't seem to do any OTA updates. I was trying to install Android 6.0 with Sense 7, but the problem is after downloading the update, when I am asked to reboot, I just get taken to my bootloader and just stay there. Nothing seems to happen. So I have no other options other than rebooting my phone.

Can anyone tell me a solution to this? I would highly appreciate any assistance.

CID: OPTUS001, Version Main: 4.18.980.11

Thanks.
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
First mistake ... you don't read post #1 --- there is no need to relock bootloader

If you restore a backup from this thread, there is no need to unroot it because the backup itself is a non-rooted backup (there's no way for you to unroot it anyway)

How do you know CID: OPTUS001, Version Main: 4.18.980.11 are correct for your device ?

Post fastboot getvar all result without serial & imei no.

then we'll see which is the correct backup
[One (M8) Q&A, Help & Troubleshooting] Perth027:
I am sorry, my bad.

(bootloader) version: 0.5

(bootloader) version-bootloader: 3.19.0.0000

(bootloader) version-baseband: 1.24.21331147A1.09G

(bootloader) version-cpld: None

(bootloader) version-microp: None

(bootloader) version-main: 4.18.980.11

(bootloader) version-misc: PVT SHIP S-ON

(bootloader) serialno:

(bootloader) imei:

(bootloader) imei2: Not Support

(bootloader) meid: 00000000000000

(bootloader) product: m8_ul

(bootloader) platform: hTCBmsm8974

(bootloader) modelid: 0P6B65000

(bootloader) cidnum: OPTUS001

(bootloader) battery-status: good

(bootloader) battery-voltage: 0mV

(bootloader) partition-layout: Generic

(bootloader) security: on

(bootloader) build-mode: SHIP

(bootloader) boot-mode: FASTBOOT

(bootloader) commitno-bootloader: 9bf3b0d3

(bootloader) hbootpreupdate: 11

(bootloader) gencheckpt: 0

Do I need to unlock bootloader and flash a custom recovery again in order to flash the backup?

Thanks in advance.
[One (M8) Q&A, Help & Troubleshooting] ckpv5:
It's best to unlock and redo the process as stated on post #1

First, you need to install TWRP 2.8.7.0 or latest

second, you need to restore the 4.18.980.11 backup not to flash the backup

then install 4.18.980.11 stock recovery.img (make sure the right one is installed)

It's better to remove all the backups that you have first (copy them to PC) so you know you have the right backup on device and only one.

You should get 3 little update before the major one.