yashsingh1/xdaforums huggingface dataset:
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] kc12:
page 169 post#1683 has the stock image with all released updates. Flash the zip in recovery, wipe cache, wipe dalvik, system reboot, say no to both questions (recovery and root) and the system will boot with stock ROM, stock recovery, and unrooted.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jerbear294:
How exactly did he get the virus?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] paratwa53:
Running any kind of OS without some kind of protection is not smart in my book. Android, Apple all can be attacked. Tell your friend to get Avast's free android protection.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] alex_is_the_1:
I've never used antivirus. Shouldn't have to, make sure what your downloading isn't shady and you shouldn't get burned.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jerbear294:
Fixed that for you. :p

I have always used antivirus. I used to use avast but now I use Cleanmaster Security.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] picrthis:
I'm not really sure since it's not my tablet, he brought it into work and asked me if I could re-flash it for him because he got a virus from move or something he was watching from a site online; he does have AVG on it, whereas I use Lookout myself.

---------- Post added at 01:10 PM ---------- Previous post was at 01:08 PM ----------

He hadAVG on it.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] kopower:
Just wanted to chime in and say how nice the Sero rom is. I had no intentions of rooting this tablet because I always thought it was fine stock. After rooting it, and installing the sero rom, I was wrong. This thing is snappy as hell now.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jachol:
Hi,

That seems to be the consensus of opinion for XBE's ROM, I just wish someone could do the same for the UK model, it would be great to have an

alternative option, the stock ROM we have this side of the pond isn't bad though, I wont knock it. ... J.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] impster:
you're not wrong there. Are there any uk based developers who fancy a go at it???!??!?!?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] nexy33:
I mailed hisense Europe multiple times with no response I opened a ticket with ebuyer they gave me a contact tel. But I got rid of mine and got 2013 nexus 7 hisense are a waste of space.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] kgoroway:
I'm trying to revert to completely stock, no root, stock recovery.

I've flash back to factory...and then wanted to get back to the stock recovery, but of course, I've lost root. So

adb shell su -c "dd if=/sdcard/stock_recovery.img of=/dev/block/mmcblk0p5"

can't find su.

So, I re-root, and then do:

adb push ./stock_recovery.img /sdcard/

adb shell su -c "dd if=/sdcard/stock_recovery.img of=/dev/block/mmcblk0p5"

adb reboot recovery

and, it boots back into xboxexpert's cwm instead of the stock recovery. Any thoughts?

And, once I do get this to take, how do I remove root?

Thanks.

EDIT: I rebooted into fastboot, and used fastboot flash recovery, and was able to get the stock recovery back onto the tablet...So, now, how do I flash back to stock, or remove root?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jerbear294:
Flash back to XBE's recovery.

Flash to stock in XBE's recovery.

Reboot from the option in XBE's recovery.

It should say you might lose root. Tell it not to restore the SU binary.

It should say that the stock recovery might be flashed once you exit. Tell it not to flash CWM recovery again.

Voila!

EDIT: If that doesn't work do what you did before to get back to stock recovery, go into SuperSU, and there should be an unroot option.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jachol:
Hi

As I read the stock ROM recovery is done via CWM, check out my screenshot does this help. ... J.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] kgoroway:
Yeah, that never goes back to stock recovery for me.

What I did was: got back to xbe, rooted, with cwm, flash stock, allowing it to unroot (not restoring SU), then, from fastboot mode, I put the stock recovery back on. It took some effort, but it's as clean as I can get it, I think.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jachol:
OK, you know your own results best, I admit I haven't needed to reflash stock as I have the UK model, and so far no one has cooked an alternative

ROM for that one, so root + CWM are the only changes.

You certainly seem to have had to take the long route. LOL. ...J
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] smokarz:
Wow, thanks so much for this root tool. So easy a caveman like me can do it.

So now that I am rooted following the instructions on post#2 (below). Can I now flash the Kit Kat Rom with the installed CWM? Thanks

Root/Touch Recovery for Stock US/UK ROM:

Note: If you have blue stacks installed please stop the service (services.msc) or uninstall and reboot.

Step 1: Download the Zip file from my GoogleDrive

Step 2: Unrar the files attached to this post somewhere (DO NOT RUN THE FILES WITHIN THE ARCHIVE THEY NEED TO BE EXTRACTED!)

Step 3: Make sure you have ADB Debugging checked. To enable go to Settings > About > Click 8 times on Build number and back out to Settings it will be under the Developer menu.

Step 4: Run XESeroRootUS.exe (US VERSION) or XESeroRootUK.exe (UK VERSION)

Step 5: Follow instructions

Step 6: Look at your tablet while it installs superuser apk it may ask for verification by Google. Just accept.

Step 7: If it hangs at FASTBOOT please check to see if fastboot drivers are installed correctly!

Step 8: Profit
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] Talon65442:
Not quite, you'll need to head over to the taktiK Android 4.4 forum and grab an updated CWM/TWRP recovery first (KK won't flash correctly from the older CWM that you got for installing XE-Sero).

I'd also suggest reading at least the last 50 (250 is a better plan) posts there to make sure you get one of the more recent builds by randomblame or davepmer and are up-to-date on what is and isn't working along with some of the more common issues.

*edit - you have a US version of the Sero 7 Pro, right?

THERE IS NO UK VERSION YET!
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] smokarz:
Thanks, Yes I have the US version. I think.

How do I check to make sure it's the US version?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jerbear294:
Under About Tablet in settings the model number should be M470BSA.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] Talon65442:
Best way: if you still have the box, look at the model number, M470BSA = US

8GB = US

32GB = UK

not sure what other countries have systems that are changed from US

*edit

jerbear294 is right... I've been running DoPa so long, even my tablet thinks that the model's gone.

Sorry all, had a Coolio moment.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] smokarz:
Thanks all.

Just to make sure one more time.

To flash the new TWRP recovery, I would need to go into the CWM receovery to flash it?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] Talon65442:
Yep

1) Boot to CWM recovery, it gets loaded into RAM (from recovery partition)

2) Flash TWRP, it gets flashed to recovery partition

CWM is over-written but remains in use since it's in RAM

3) Reboot to recovery, TWRP gets loaded into RAM (from recovery partition)

4) Profit
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] lichan:
can the newer SELinux-enabled recoveries be used to flash the DoPa/XE ROMS? If so, switching would be advised because of greater flexibility/capability.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] Talon65442:
Yes...

you MAY need to comment out a few lines in the updater-script.

Easy to do (need a PC, though).
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] vyv23:
flashing the tabletUI mod?

So, I just rooted/cwm sucessfully, I flashed the rom successfully, NOW, I am trying to flash TabletUI Mod, it is supposed to be flashable but I see alot of files when I am directed to the link, which one am I supposed to download and flash? I read the about 50 pages of this rom forum, I could not find anything about it. Please help
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] Talon65442:
If you flashed DoPa v2.0, no need to flash the UI Mod. It's baked in.

If you flashed

Want to flash a Deodexed version of the stock OS so you can build you own rom? Okay fine here you go!

[US ROM] Sero 7 Stock Rom (P756.6.01.11.00) [Deodexed]

[US ROM] Sero 7 Stock Rom (P756.6.02.11.00) [Deodexed]

or

Want to flash a Deodexed version of the stock OS but keep your current data? Flash this ROM it will retain your data partition.

You can then boot into it once then flash a tabletUI and battery mod

[US ROM] Sero 7 Stock Rom (P756.6.01.11.00) [Deodexed/NOWIPE]

[US ROM] Sero 7 Stock Rom (P756.6.02.11.00) [Deodexed/NOWIPE]

you can use the

[US MOD] Sero 7 Stock (P756.6.02.11.00) tabletUI [Deodexed] (both links are exactly the same)

If you flashed

Want to revert back to Out of the box stock OS [ODEXED]?

[US ROM] Stock Sero 7 Pro Rom (P756.6.01.11.00) CWM Flashable zip

[US ROM] Stock Sero 7 Pro Rom (P756.6.02.11.00) CWM Flashable zip

[UK ROM] Stock Sero 7 Pro Rom (P756.6.01.04.EN00) CWM Flashable zip

NO TABLET UI FOR ODEXED DO NOT FLASH IT
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] vyv23:
[US MOD] Sero 7 Stock (P756.6.02.11.00) tabletUI [Deodexed] (both links are exactly the same)

I went to the US MOD link (tabletUI), but it has 9 files showing if you go to that link, which file am I supposed to use to flash? or better yet, how can I flash it using the 9 files located on that link.

this is the rom I installed, is the tablet UI already baked in the rom?

[US ROM] XE-SeroROM v².² 213 DPI [Slightly Stripped] P756.6.02.11.00 - POST 3
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] Talon65442:
Ah, I see it's been moved to google drive.

*edit* this still applies

Top of page will say "XE-Sero7Pro-4.2.1-tabletUI_v2.zip" (which is the zip file, the files you see are what's in it)

click 'File' then 'Download' ... just flash the zip

No, that particular mod isn't baked in.[/strike]

you want any of these, from post 3

[MOD] TabletUI Mod v² w/ Stock Battery Icon

[MOD] Green Circle Battery Icon (with charging animation)

[MOD] Blue Circle Battery Icon (with charging animation)

[MOD] Green Tiny Circle Battery Icon (with charging animation)

[MOD/My Favorite] Blue Tiny Circle Battery Icon (with charging animation)
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] vyv23:
hmm, I see, sorry, I was trying to get file from my mobile device, and I had to ask the phone to see the site as a Desktop site so I can see the option FILE- download... Thank you so much
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] MrScientist:
thanks, this process worked great to root my device. had to replace the included cwm image with the newer image to get kit kat though.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] intrepid9:
Just wanted to say that this was probably the 2nd easiest root I've ever done. Thank you for the script!
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] impster:
This thread has gone quiet. Anyone still working on the hisense? Doesn't look like any manufacturer updates coming - well, not to the UK version at least.

Tried a friends' Asus Memopad HD7 yesterday. Hisense beats it hands down.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jwernerny:
Most of the active work is being discussed on another thread: [Dev/Rom] Sero 7 Pro taktiK Android 4.4.2 R13 available, and there is a good amount of work going on.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] impster:
ok, many thanks. didn't know that. Don't come to XDA as often as I used to. Thanks ;)
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] ad720:
I'm having an issue, hoping someone has some insight...

I'm trying to return to stock.

Using these instructions and links:

Want to revert back to Out of the box stock OS [ODEXED]?

[US ROM] Stock Sero 7 Pro Rom (P756.6.01.11.00) CWM Flashable zip

[US ROM] Stock Sero 7 Pro Rom (P756.6.02.11.00) CWM Flashable zip

[UK ROM] Stock Sero 7 Pro Rom (P756.6.01.04.EN00) CWM Flashable zip

NO TABLET UI FOR ODEXED DO NOT FLASH IT

Boot to CWM Touch Recovery (No USB Cord, Volume - and Power On)

Step 1: Wipe System

Step 2: Wipe Data

Step 3: Wipe Cache

Step 4: Wipe Dalvik-Cache

Step 5: Flash the zip located in above

Step 6: Reboot (Choose Yes to disable recovery flash and when asked if you want to root you can choose yes if you want to add the su bianary - see step 7)

Step 7 (optional): Once rebooted if you chose to root in CWM, download SuperSU from market then run it and update the binary to become rooted.

I am hanging forever at the Hisense "Smart" screen. Any ideas?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] kc12:
the absolute easiest way to go back to stock US version is to flash the stock rom supplied by Dolorespark here post#1683 : http://xdaforums.com/showthread.php?t=2297246&page=169

put the zip on your external sd. ( you may have to power off the tablet, remove the sdcard and put the zip on it using your pc. Put the card back in the tablet and power on to recovery)

boot to recovery

factory reset

wipe cache x2

flash stock zip

reboot system - SAY NO TO ROOT AND RECOVERY QUESTIONS TO UNROOT AND FLASH BACK TO STOCK RECOVERY.

tablet will boot back up to stock rom with stock recovery unrooted.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] ad720:
Thanks but still hanging at the Hisense Smart logo. I can get to stock recovery and tired doing another factory/cache wipe. No luck hanging on Hisense logo.

I think we have a brick.

EDIT: Spoke too soon! That did it. Thanks a bunch.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] JasonZech:
Got a question. I tried changing my boot animation now it's stuck at the first hisense logo and just vibrates when I hit a button. Is there a way to restore the original bootanimation.zip in /system/media folder without having to boot up or flash a new ROM? BTW I never did do a backup which once fixed that will be the first thing I do.

sent from a LG-MS870 using Katana v3 ROM by GT
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jerbear294:
Find a flashable boot animation for the Sero. Worst case scenario just flash the stock ROM.

For future reference I use Boot Box to change the boot animation. The program works like a charm.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] JasonZech:
Thanks for info. I decided to go ahead and flash a custom ROM. I used XE sero ROM. I'm thinking about using tiktak to upgrade to 4.4.2. Besides dopa ROM what other ROMs are there for this tablet. I can only find a few threads about this Tablet.

sent from a LG-MS870 using Katana v3 ROM by GT
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jerbear294:
There are ports of CyanogenMod 11, PAC, LiquidSmooth, Carbon, AOSP, OmniROM, and Gummy. All are 4.4.2.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] JasonZech:
Really? Hmm I cannot seem to find the forum on here for it using tapatalk. Using tapatalk what forums and subforums do I use to get to them? I'm still new to these forums. I can navigate android forums easy (a whole lot less Forums to shift through. LoL)

sent from a LG-MS870 using Katana v3 ROM by GT
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] chameleo78:
There is no forum, just threads. Do a search for Sero 7.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] Talon65442:
Most of the direct file links are here [Start/Here] Hisense Sero 7 Pro Development Home Base

as for discussion of said ROMs and Kernels, most if it has 'hijacked' (kind of a good thing, all the dev's are very collaborative) this thread

[Dev/Rom] Sero 7 Pro taktiK Android 4.4.2 R13 available
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] xboxexpert:
[ROM][4.4.2][m470] BeanStalk 4.4+ For Hisense Sero 7 Pro [METICULUS]
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] joeylikesubuntu:
taktik rom

the taktik rom is nice installed without error not bad for a high school dropout lol but the keyboard didnt work i had to run Gapps minimal install in recovery to get it to work now the thing i want to know is how would i go about installing ubuntu touch on it i tried multirom manager but it says its unsupprted device unknown is there an alternative app that would work and could someone provide links for ubuntu touch and a multiboot app or even another thread
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] horn34:
If I'm not bricked, I'm pretty close. I can't get anywhere but the stock green font "FASTBOOT" screen. I've followed these instructions:

I ran XERecoveryUS.exe, the Sero 7 is recognized, the script runs, then reboots it. It reboots to the red KatKit screen, then goes blank. That's it, won't go any farther. This is what the script is doing:

The script is not moving after an hour. The Sero screen is blank. I'm stuck and really need some help.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] horn34:
after several tries pushing that script and different timings of the volume/power button on reboot, I was finally able to get back into CWM. Unfortunately it's not letting me flash ANY roms, including the original stock, it keeps throwing a Status 7 error. What I've read online seems to indicate that CWM is rejecting the roms due to a line in one of the files, thinking the rom isn't matched with the right phone/table. These are all definitely the right roms. One remedy involved removing that line, but I did that and got a Status 6 error. I can't boot into android to use any apps, so I'm limited to what I can sideload, which so far is just being rejected by CWM. Any ideas?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] dolorespark:
The first thing you need is a new Recovery. The version you have should have let you install files on this thread but nothing newer (i.e. Android 4.4.x/KitKat). Since it seems to be broken, it's time for an upgrade.

Go to this thread where there are links to most Sero 7 Pro ROMS. In the 3rd post, davepmer has made a bunch of replacement recoveries available. Get one of the Philz-touch versions (an enhanced CWM) and try to flash that from your existing CWM, then reboot back into recovery. If successful, you should be able to flash any of the ROMs listed in that thread.

If that fails, no problem: force the tablet off, disconnect any USB cable (important), then reenter Fastboot (Vol+ & Power). Next

unzip

your copy of Philz-touch, reconnect your USB cable, and enter this at the command prompt:

fastboot flash recovery C:\ [path to unzipped Philz] \recovery.img​

When it's done, power off, disconnect the USB, then reboot to recovery (Vol- & Power). You should be good to go.

P.S. There are a lot of ROMs available. Personally, I'm partial to AOSP v4.4.2 DoPa v1.1, in part because I built it, but more important because it's very stable. Note that when you upgrade versions, you will

have to

reformat the /data and /cache partitions, wiping out everything on your tablet. Philz-touch provides CWM's backup feature, so you may want to use that first.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] violentmind:
Best Root/Rom package I have ever had the pleasure of flashing. I need to donate on payday for sure. Not a single problem with the entire process. The 2.2 rom breathed new life into this aging tablet. You have set a new standard here! 1000 kudos to you and your future endeavors.

If only I could get something this cool for my wife's sero 7 Lt. All the Roms I have come across for the Lt version suck.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] horn34:
Thanks for the tips, I'll try them out.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] oldcotton:
I flashed XE-SeroROM v².² 213 DPI and I really like the default blue wallpaper. However I changed it by accident. I want to change it back but couldn't find it. Anyone could please tell me where to find the default blue wallpaper? Thank you!

Update: Issue resolved by searching in the thread. Searching in thread function doesn't work when I post the question.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] nicedog:
I wanted to go back to stock so I flashed "Stock Sero 7 Pro Rom (P756.6.02.11.00) CWM Flashable zip" (I tried both [ODEXED] and [DEODEXED]) , flash went well, then I rebooted it, but after "hisense" logo showed up, the screen went blank, I could tell the backlit was still on, but nothing was on the screen. Can someone please help? Am I missing something?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] nicedog:
answering my own question. here's how I got back to stock successfully.

enter fastboot mode (power + volume up)

fastboot flash recovery stock_recovery.img

fastboot flash boot stock_boot.img
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] gberpa:
I already returned my tab for extended warranty rfund

---------- Post added at 02:39 AM ---------- Previous post was at 02:36 AM ----------

when I enter 'fastboot', there are no options as in 'recovery'. so how did you retrieve the images?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jerbear294:
Fastboot's supposed to stick at that fastboot screen. You interact with it via command prompt.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] blackinches:
Dumb question.. Do I have to have an SD card to install the rom from CWM?

I rooted, flashed CWM, threw the rom and gapps on the device via USB in windows. Rebooted into recovery, didn't see the zips...
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] nicedog:
Once you have entered "fastboot" mode, these are done from command line,

=============

fastboot flash recovery stock_recovery.img

fastboot flash boot stock_boot.img

=============
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] holabr:
I installed the ROM as outlined in Post #3, rebooted, set up Google Play and then installed Tablet IU. The problem is the 4 nav buttons are still centered on the bottom with the screen capture button and the status info is still on the top of the screen. What did I do wrong?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] xboxexpert:
Wrong tabletUI flashed? Maybe flashed a tabletUI revert?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] holabr:
Dah!!! Thanks for the response. As they say "User error". I feel so dumb. I installed tiny battery instead of Tablet UI. Sorry.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] xboxexpert:
Going forward I will not be responding to ANY PM's regarding assistance towards Sero 7.

I will also not accept payment offers geared towards me providing service repair on the Sero tablet line.

Thank you,
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] dolorespark:
Attn: International Users/Lurkers

-----Edit-----

I've developed a Kitkat ROM which is compatible with the US, UK, and Australian versions of the Sero 7 Pro ('m470', 'm470bse', and 'm470bss' respectively). A beta version is now available. Please see this posting in the DoPa AOSP thread.
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] jweavis:
I have the US model that started stopping reboots at the loading ROM screen. I was just running the rooted stock w/ stock bootloader. Since I've flashed CWM, TWRP, and ran the script. Tried four different ROMs and all, even after 20 minutes, still stay at the ROM boot screen. Any advice?
[Hisense Sero 7 Pro ROMs, Kernels, Recoveries, & Ot] dolorespark:
Marshmallow for the Sero 7 Pro (US/UK/AU/DE)

If you'd like to upgrade your stock ROM to the newest version of Android (Marshmallow), head on over to this thread, Sero 7 Pro (US/UK/AU) - AOSP 6.0.1 DoPa6 v1 for a ROM that's compatible with all versions of the Sero 7 Pro sold worldwide (US/UK/Australia/Germany).