yashsingh1/xdaforums huggingface dataset:
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
As you can see from the first pic the mount path is /dev/block/platform/7824900.sdhci/by-name/ which is the same as /dev/block/bootdevice/by-name/ (bootdevice is the generic name for 7824900.sdhci given in the kernel command line)

So how the heck /dev/block/platform/soc.0/by-name/system in the installer-script works I don't know?

The next time you install RR, could you pull the recovery log and post it. I'd be interested to see the output!

Anyway here is the the new build with the A5 kernel, if this works I'll be very surprised. I don't even expect the touchscreen to work. Good luck. :silly:

https://www.androidfilehost.com/?fid=24533103863139712
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
HrHr Ok i will test in a Few Min, and Report, I Pull a RR recovery log tomorrow ;)

Edit:

like you said touchscreen didn't work but Power Butten Lock´s it, that's at least something :silly:

btw. did you mean the last log file (from which TWRP Version) or a catlog? and if both not give me a hint :D
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Use the recovery that works and post the recovery.log.

Also you have me a little perplexed. I fully expected the touchscreen not to work due to your comment in post #19 of this thread.

There you said the touchscreen didn't work, however I could have sworn I used the exact same kernel and dtb for the twrp test build I built with OTG working earlier.

How come all of a sudden the touch screen works in that?

Is this some kind of Frankenstein phone? :what::sly:

Anyway I will come back to this as I don't understand why Samsung have USB OTG hardware support in this device, but don't support it in the software.
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
It's almost tomorrow at my Place :silly:

Did Screens what i was doing after first Start i saved last log

Yes Samsung Software are always :rolleyes: and yes it is a Frankenstein phone :cyclops:
[Galaxy A3, A5, A7, A8, A9 Android Development] EZEman00:
Hi guys, i dont know what is wrong when i try to flash twrp....

when odin "Pass" i disconect the usb cable and restart with power+menu+vol down and then press vol up holding the others 2... but it goes to downloading with "could not do normal boot" "ODIN MODE" in red...

i think i follow the steps correctly but...well... there is not twrp instaled or i cant boot it hahaha

btw... i'm in stock kitkat rooted with kingroot...
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
You need to upgrade your bootloader to lollipop. You are using a kitkat bootloader with a lollipop kernel.
[Galaxy A3, A5, A7, A8, A9 Android Development] EZEman00:
So... if i Flash first lollipop with odin... then i'll can Flash This recovery? Bootloader and kernel gets upgrade flashing firmware no?
[Galaxy A3, A5, A7, A8, A9 Android Development] EZEman00:
Thanks!! For do backups before Flash lollipop I must Flash twrp 2.8.7 at first?

Sorry for ask too much... im a noob with Samsung and my english isnt ver y good... :D
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
I guess it's also for Android 5.x Back up you Data in a Cloud or on your PC after doing that Flashing latest Stock Rom, Root the Device and Install TWRP from First Site on this Thread.

Here is a Noob friendly guide you get also Information and Help at the Everything Samsung a3 Thread
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
[MENTION=6167869]Jonny_Hood[/MENTION]

When looking at the defconfig for the kernel it seems OTG should be supported.

Is your OTG cable powered? It may be that the device isn't designed to provide its own power. A powered OTG may work.

I think the kernel that allows OTG to work is a custom kernel and may be modified to supply it's own power.

I'm gonna build another kernel using a different source.

In the meantime it may be worthwhile contacting mygalaxya to ask which source he used for the kernel in 3.0.0-1
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
It has a Port for x-tra Power but i didn't use it, I did direct a fast Test with otg 2 Build from Post 59, the Stick starts blinking but no connection probably the blinking is related to the Power, i did Reboot with MTP Disabled also and Saved the Log.

Edit: It's the power, stick starts also blinking without phone

Edit 2:
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Any luck with this, built from a different source: https://www.androidfilehost.com/?fid=24533103863140524
[Galaxy A3, A5, A7, A8, A9 Android Development] EZEman00:
working in my A300m! just...beautiful! thanks ashyx for your work and thanks too Jonny_Hood for help! :D
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
First of all i'm deeply impressed how fast you did this all, amazing skills :)

And Yes you did it, MTP and OTG Working Flawless (without x-tra Power)

Doing some Test now! Report later :D

Edit Tested:

Partition SDCard, Installing, Backup & Restore tested from Internal Memmory, SDCard and OTG :good:

Reboot from Recovery to Recovery is the only thing not Working, it will Reboot Device to System and one time the Device Powers off :silly: the others like Boot to Download work flawless

And as expect the cbolumar ROM´s cannot be installed caused by install script (Pic´s) but they are Discontinued like all the buggy CM12.1 ROM´s for the FU Device, and i guessing we get soon CM13 from mygalaxya and no one will care about CM12.1 anymore ;)

So i guess there is no need for a Fix, for me it is now the Perfect Recovery for the FU Device :D
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
any chance to fix the adb shell output issues, the backspace output is killing me, and i adb shell a lot.

I thought it was my windows adb set up (cmd and powershell), but it seems to have the same issues on OS X and Linux.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Make sure the USB cable is out when rebooting.

Not sure I follow?
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
Tested it again (to get sure) Boot from Recovery to Recovery -> Boot to System ;)
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
So it was working now it's not? :what:
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
No if i tab in the Reboot menu Recovery the Device boots not in the Recovery it does a normal Reboot to System

sorry for confusing :p
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
I mean in the previous version without working OTG?
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
Boot from Recovery to Recovery Working in all previous builds, double check it this Morning

Post 01 - twrp_3.0.2-1_sm-a300 - Yes

Post 58 - twrp_3.0.2-1_sm-a300_otg - Yes

Post 59 - twrp_3.0.2-1_sm-a300_otg2 - Yes

Post 64 - twrp_3.0.2-1_sm-a300_otg_test -Yes

Post 68 - twrp_3.0.2-1_sm-a300_otg_fix - No Touch

Post 80 - twrp_3.0.2-1_sm-a300_otg_fix2 - No

Edit: since Post 56

I tried this :)
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
You're probably one of the best testers anyone could have. :cool:

OK from that it's pretty obvious it's a kernel issue.

This also explains why people have the same issues with CM builds as they use the same kernel source.

It seems the kernel passes incorrect arguments to the bootloader.

What happens if you type :

reboot recovery

In twrp terminal or adb shell?
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
I have too much Time, and a lot of Fun testing things :D

So in TWRP Terminal it Reboot to System and in ADB Shell it Powers down

Edit: If cable is plugged to PC or Power and i type it in TWRP Terminal it Powers also down oO
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
it displays unusual characters, like backspace does not actually delete anything visually and outputs some strange characters forward, although it does delete the text. Quite annoying with TAB, as it scrambles what you are typing and can lose focus in split second, very deadly in shell environment :(.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
[MENTION=6167869]Jonny_Hood[/MENTION] are you having this issue?
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
I do not so much with ADB (a real noob) i get output like the Pics in Post 67

But if you write me commandos for ADB i can make screenshots :p
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Just boot into recovery then type :

adb shell

Just type something then try and delete it with back space.

See if you have any weird characters popping up.
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
Tried in Recovery (with and without cable plugged) look at the Pic... ADB not found

And at Win7 CMD no Problem after ADB Shell i can type and Delete regular nothing weird happens
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Everything looks perfectly normal to me. :sly:

Just to be clear you were booted to recovery when using adb?

You don't need to type adb shell or su in recovery terminal as you are already in a root shell.

Well done. Thanks.

[MENTION=4695607]PlutoDelic[/MENTION] see above
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
Ok i did´t know that with terminal, like i said i have minimal experience with adb, but learned that today :p

Yes I was booted to recovery when I using adb at PC
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
very strange indeed, it is the only phone i have this issues with, had it even on TWRP 2.

Shell is ok if adb shell in booted up system.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Try updating your ADB drivers and binary to the latest.
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
This is the binaries i use in Windows, but Ubuntu and OS X had the same issue.

And these are the drivers i used: Samsung USB v1.5.59 and UniversalAdbDriver
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
Strange i believe i got my ADB over Android studio and a Youtube description, so i did the complicated way as usual :p

But if you said it's on Ubuntu and in OS X the same i guess it's something with your phone, did you try to delete all with TWRP and after that Flash Stock ROM again?

That helped me with a WLAN issue and other small things i know it´s not the same but that would be the thing i would try as noob. :p

Sorry that i can't help more.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Have you tried the version in post #80?
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
yes, all of them. the one on the main page, the one with the A5 kernel and otg fix, and like i mentioned 2.7.8.0.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Are you using native Linux or virtual?
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
I used a Ubuntu Live USB
[Galaxy A3, A5, A7, A8, A9 Android Development] Marecki_:
How to unpack the tar image? I can't find a way so this new version 3.0.2-1 could be seen by my old twrp 2.8.7.0.

I unpacked the recovery.img but it is invisible in twrp same as tar.

Edit: Ok got it, have to choose install/images and then choose recovery .img. Flashed, all is well.
[Galaxy A3, A5, A7, A8, A9 Android Development] helphelphelphelp:
Not a single one of the download links work right now. How long is this androidfilehost.com gonna be down?

Which version do you recommend for sm-a300h?

Can you or someone re-upload a working version for sm-a300h please?
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Links are working just fine.
[Galaxy A3, A5, A7, A8, A9 Android Development] helphelphelphelp:
OK, now they are working. Do you recommend last posted link in post #80 for sm-a300h?
[Galaxy A3, A5, A7, A8, A9 Android Development] helphelphelphelp:
yeah worked.
[Galaxy A3, A5, A7, A8, A9 Android Development] fvisagie:
I get the same problem ('adb shell' backspace etc. not working correctly) on my Windows 7 machine. The problem seems to be partially adb-related, though.

With the latest

that comes with Android SDK 25.1.7 I get this problem on my Nexus 7 3G with both TWRP 3.0.2.0 and CWM Recovery 6.0.4.3. I haven't yet tested this version adb from within Android.

With

that comes with Android SDK 24.0.2 I get the problem only with TWRP, and not with CWM Recovery.
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
i think, TWRP and CWM use different kernels, hence the difference.

I am not sure if i mentioned it before, the problem is not present in the booted android, with no matter what adb (just tested with Android Debug Bridge version 1.0.35 Revision fc2a139a55f5-android)
[Galaxy A3, A5, A7, A8, A9 Android Development] fvisagie:
You're quite right :).
[Galaxy A3, A5, A7, A8, A9 Android Development] fscussel:
tell me something. Why can't I just boot in recovery mode and flash cf-autoroot from there without previously installing twrp recovery? won't preserve knox counter?
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
The stock recovery allows only signed packages to be flashed (OTA, Stock stuff, etc).

TWRP, flashes everything as long as the package is flashable, hence why it triggers knox or voids the warranty.

CF-Autoroot is a package allowing you to achieve root without touching the recovery. You do not flash CF-Autoroot when you have a custom recovery, that wouldn't make any sense. What you usually flash on TWRP/CWM is the naked package of SuperSU (included in CF-Autoroot, and delivered by the same author), as with a custom recovery, you can touch the system partition without any permission problem, again, HENCE why custom recoveries trigger Knox.

Many of these questions are answered around, asked by other people, it is a matter of resourcefulness to be able to ask your self what you need to know, and actually search that. The answers you seek are 99% present in XDA, searching them can spare you a lot of time.
[Galaxy A3, A5, A7, A8, A9 Android Development] yash92duster:
Thanks a lot

TWRP works great on A300H:D:good::good:
[Galaxy A3, A5, A7, A8, A9 Android Development] valentin_nichita:
Hi, is this recovery compatible with A300FU with Android 6.0.1 or i have some problems? Thanks
[Galaxy A3, A5, A7, A8, A9 Android Development] Eserim:
OK - am I being super thick here? I get as far as this, and have no idea what/where the "respective file below" is. Sorry if it is obvious.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Erm...twrp_3.0.2-1_sm-a300?
[Galaxy A3, A5, A7, A8, A9 Android Development] Eserim:
Sorry, I read the first page as meaning that there is a different file to flash in Odin, that installs and earlier TWRP, then you use that earlier version to flash twrp_3.0.2-1_sm-a300 -

I see now, two options to do the same thing. I was reading it wrong.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
No its an option. Either flash with odin or extract and install with twrp.
[Galaxy A3, A5, A7, A8, A9 Android Development] Giuskiller:
could it work if i've updated my device to marshmallow 6.0.1??? Please answer

Thank you
[Galaxy A3, A5, A7, A8, A9 Android Development] Eserim:
see http://xdaforums.com/showpost.php?p=68617039&postcount=18 PlutoDelic has upgraded his A200FU to 6.0.1 and reported that this method works
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
I just flash recovery.img from xxx_otg_fix2. It finished favorably but i can't boot into system always show the SEandroid warring and boot into recovery. I can only boot into Download mode. I just flashed stock rom via odin. Phone boots up but can someone tell me what's gone wrong? Galaxy a3 (a300fu XEO Poland 5.0.2) After flash stock rom the stock recovery still boots when rebooting phone but it can reboot into system. Im trying to flash 2.8.7.0 twrp and restore backup.

EDIT:

Ok sorry. My mistake :) I didn't read the Johnny_Hood's post. Everything great but it didn't repair the SEandroid warning and reboot bug. Flashed via old TWRP 2.8.7.0 (recovery.img otg_fix2 flash image option) A300FU 5.0.2
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
Is the A300FU support OTG in system level? Or only in this TWRP? I bought a OTG cable on ebay today and wanna use this to xbox 360 pad.
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
At the moment OTG is only supported in this TWRP for the FU Device
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
How can we change this? The cyanogenmod will have this function?
[Galaxy A3, A5, A7, A8, A9 Android Development] Jonny_Hood:
At the moment there is no fix for OTG at System, it´s not only ROM related as i understand it, it need´s also a modified Kernel for the ROM, so i´m not sure if it will implemented....
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
OK. Unlucky me bought OTG cable and then learned it's not supported :| But maybe it will useful in recovery
[Galaxy A3, A5, A7, A8, A9 Android Development] SidRose01:
[MENTION=4899305]ashyx[/MENTION] can I flash Stock A300H (India) over Stock A300F (somewhere when from gulf)
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
This thread is about recovery not about stocks.
[Galaxy A3, A5, A7, A8, A9 Android Development] mefsaal:
Good work. Thanks
[Galaxy A3, A5, A7, A8, A9 Android Development] Hubird:
I can't get the TWRP to work on A300M Marshmallow.

Odin seems to work fine but I can't get TWRP up and running, only the stock recovery.

Any suggestions"?
[Galaxy A3, A5, A7, A8, A9 Android Development] bovirus:
[MENTION=4899305]ashyx[/MENTION]

Could you please update the language for the recovery (ex. adding Italian)

Could you please change some defaults (like set 24h time and disable timeout on display that sometimes freeze some situation)?

is your recovery with official Samsung OTA update?

If TWRP recovery is not compatible with official OTA updates how can I just reflash only stock recovery starting from stock firmware?
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
If you have general bugs regarding twrp then you need to file these with TeamWin.

You can't install ota's with custom recovery. You will either need to restore stock recovery or use odin.
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
found another recovery-bootloop

after any ZIP installation, or even manual reboot from the menu, if you happen to have the USB cable still on, it will bootloop back to recovery no matter what you do. Reflashing TWRP solves the issue.
[Galaxy A3, A5, A7, A8, A9 Android Development] alexcam99:
what to do

I have a galaxy a3 (A300H), when I go to devoloper options, i dont see the option to enable the oem unlock :( , why it is passing, what can i do?, if i dont enable that options, and flash the recovery, what will it pass?
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
On A3 you don't have to unlock it. The OEM is unlocked in stock. S you can flash everything just now
[Galaxy A3, A5, A7, A8, A9 Android Development] redymedan:
Does it works on android 6.0.1 MM? answer please..
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
Yea it works on MM
[Galaxy A3, A5, A7, A8, A9 Android Development] alexcam99:
I have a A300H, can I use the twrp_3.0.2-1_sm-a300_otg_fix2.tar to flash in my phone.

in the case that i can use it, is this the only file that im gonna use?
[Galaxy A3, A5, A7, A8, A9 Android Development] ** A - R **:
TWRP Update 3.1.0-0

@ashyx, Can We get An Updated version ?
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
We're quite settled down tbh and am very happy to have at least 3.0, but 3.1's ADB Backup feature is something i always got a mouthy water from, very much needed.

Hopefully :)
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
I'm currently updating my builds, I have many, so bear with me. :eek:
[Galaxy A3, A5, A7, A8, A9 Android Development] mcastellon:
A3H single sim here bro..... I'll wait, thanks for bringing support for our devices.
[Galaxy A3, A5, A7, A8, A9 Android Development] ** A - R **:
I Genuinely Apologise Mate.

I'll be Patient.

Appreciate Your Effort Dear.

God Bless You.

Keep Up the Good Work.

Kudos :good:
[Galaxy A3, A5, A7, A8, A9 Android Development] PlutoDelic:
Splendid news, backups will be a lot easier after this one :).

Thanks a lot.
[Galaxy A3, A5, A7, A8, A9 Android Development] dogukans3131:
Thanks man

your TWRP is working perfectly
[Galaxy A3, A5, A7, A8, A9 Android Development] dogukans3131:
adb sideload is not working (not problem for me)
[Galaxy A3, A5, A7, A8, A9 Android Development] tvroman:
Works Perfectly on SM-A300FU with Lineage OS

First of all a great many thanks for a very

clear & concise

set of instructions. It's amazing how many people forget to include something fundamental to success in their write-ups.

I successfully followed your instructions and installed "lineage-14.1-20170330-UNOFFICIAL_a3ltexx_a3ultexx_a33gxx_vlw.zip" without issue.

:cool:

(The important bit I was missing was the necessity to use a very specific version of TWRP)

Many thanks again.

The phonetormentor
[Galaxy A3, A5, A7, A8, A9 Android Development] theodoros_1234:
I don't know what to install the "recovery.img" image as (while in TWRP). I'm sure it's recovery, but I don't want to screw something up. Could someone tell me, please? Thank you.

EDIT: It looks like you should select recovery.
[Galaxy A3, A5, A7, A8, A9 Android Development] emtepe35:
Do you want to flash it via older recovery or odin?
[Galaxy A3, A5, A7, A8, A9 Android Development] theodoros_1234:
No, thanks. I was unsure if I had to install it as recovery from TWRP or not. It looks like I have to install it as recovery. I already did that, but still thanks.
[Galaxy A3, A5, A7, A8, A9 Android Development] donaldyg81:
Hello community, I read all the post and I have some doubts about what android version works with this recovery... for SM-A300F/G/H/M it will work in KK and LL??? and for SM-A300FU it will work for LL and MM??? Sorry my english... and thanks in advanced....
[Galaxy A3, A5, A7, A8, A9 Android Development] Parnas72:
Hi,

for A300-FU it surely works with both Lollipop and Marshmallow stock ROMs (I've used it myself on both).

Don't know about other devices.
[Galaxy A3, A5, A7, A8, A9 Android Development] yash92duster:
Deleted
[Galaxy A3, A5, A7, A8, A9 Android Development] Exodus_5467:
Flashing this will wipe the data?
[Galaxy A3, A5, A7, A8, A9 Android Development] xn0live:
twrp_3.0.2-1_sm-a300

link not working more
[Galaxy A3, A5, A7, A8, A9 Android Development] carlosnewmusic:
SM-A300M

SM-A300M does not work when restarting in recovery it remains in download mode saying "could not do normal startup", then flashes back to recovery and returns to normal startup
[Galaxy A3, A5, A7, A8, A9 Android Development] jones1978.c:
Can you tell me what TWRP to use as there so many Cheers
[Galaxy A3, A5, A7, A8, A9 Android Development] silentone84:
Having trouble with your method.

Model SM-A300F European edition. Baltics market.

I get so far as to flashing twrp with Odin. But using your method to get to freshly installed Twrp does not work.
[Galaxy A3, A5, A7, A8, A9 Android Development] DualJoe:
Please update to 3.3.1 or publish the device tree. Official TWRP is broken.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
UPDATE: TWRP updated to 3.3.1-1
[Galaxy A3, A5, A7, A8, A9 Android Development] DualJoe:
Do not flash! This is a hard brick. It crashes faster than the pause that is needed to get into download mode. I have no clue how to fix that. The phone is rebooting permanently at the moment. I think i have to open it and remove the battery. You did not test it Ashyx...
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Pause? Just hold power + home + vol down until download mode shows.

Its certainly not a hard brick, rather over dramatic. :rolleyes:

Also, what is meant by crashes? It is built from the same sources as the version in the OP.
[Galaxy A3, A5, A7, A8, A9 Android Development] DualJoe:
It doesn't react on vol+dn + home. It constantly reboots to Samsung logo within 2 secs with shown 'recovery' mode. There is nothing i can do. Maybe the key controller is dead.
[Galaxy A3, A5, A7, A8, A9 Android Development] ashyx:
Just hold the keys for long enough and it will boot to download mode and its power + home + vol down .