[Huawei MediaPad T5 Guides, News, & Discussion] Fosanz:
Hello there. Hope this helps!

FIRST OF ALL, this WILL VOID your waranty. Read the steps BEFORE doing anything

ALSO PLEASE READ THE NOTES AT THE BELOW POST.

UNLOCK BOOTLOADER: It's not "easy" at all (You'll have to open your tab).

Go to device info on tab settings.

Press compilation number for several times until "you're a dev" message appears (It'll prolly ask your pattern/password to continue).

Go to dev options and enable OEM unlocking.

Shut down the tab.

Download PotatoNV sofware from here. (Credits to mashed-potatoes)

Download minimal adb and fastboot from here.

Prepare your environment:

Open your tablet

Grab a clip or a cable

Keep your cool

Follow the steps shown here. KEEP THE GENERATED CODE. This will avoid you from opening again the tablet in the case you have to do a downgrade. The way to unlock it again is writting

"fastboot oem unlock <code>"

at fastboot mode.

Here you have an image of where the testpoint is.

FLASH TWRP INTO THE TAB:

Follow CAREFULLY this steps:

Shut down the tab

Connect the tab to the PC and hold vol- & pwr button.

Now it'll appear a white screen with some text. If it appears "OEM unlock" in green, then everything's fine. IF NOT, follow unlock bootloader steps again. Then try rebooting into fastboot mode again (vol- & pwr).

Download Pretoriano80 .5 version TWRP from here.

Open Minimal ADB and Fastboot and write this:

"fastboot flash recovery_ramdisk path_of_twrp.img"

It should appear everything OK.

Type "fastboot reboot"

Fastly disconnect the tab from PC and hold vol+ & pwr button before Huawei logo appears (if it appears, just do a hard reboot (hold pwr button) and try again (just hold vol+ and pwr, no need to go back to fastboot).

You're now booting into TWRP!

RESOURCE DOWNLOAD

DOWNLOADING UNTESTED ROMS MAY LEAD TO MAJOR ERRORS

All HI6250 ROMs are "compatible" in some way, wouldn't recommend to install unless proven

A list with all tested and proven to work ROMs can be found here

Download any ROM you want from the above link. The list will be increasing with the time

Download the data decrypter from the MEGA folder (you can also find the link in the ROM list)

(OPTIONAL) you can download gapps. You can also download the version worked for me (little outdated) at the same MEGA link and update them later at the PlayStore.

(OPTIONAL) You can download Magisk from the "ZIPS" folder at the Mega link. GENERIC MAGISKS MAY (99%) NOT WORK ON THE GSIS.

PREPARATION STEPS

Boot into TWRP (vol- & pwr buttons while tab is off)

Don't make system Read Only (Just swipe the first window). This will lead you to a multiple choice menu

Head to INSTALL and select the decryter you will have in a SD card.

Swipe to confirm installation

Go again to main menu and head to WIPE and select "Format data option".

Type "yes" on the keyboard and press enter.

Then go to main menu and head to REBOOT>RECOVERY

If a message appears saying you to install TWRP app, just decline it.

Once in TWRP again, head to WIPE>ADVANCED WIPE and select dalvink/art cache, cache, data and system.

MARKING OTHER THAN THIS OPTIONS WILL LEAD TO AN IMPORTANT ERROR.

Return to main menu

THERE ARE 2 WAYS TO INSTALL A ROM:

1 -- VIA FASTBOOT:

Reboot your tab into fastboot mode (vol- & pwr buttons while connected to PC)

Open minimal adb and fastboot and type:

fastboot flash system <path_of_rom>.img

Now, wait... (Sparse header file error it's normal)

Once it has finished, type: "fastboot reboot" and disconnect from PC

2 -- VIA TWRP:

Once in TWRP head to INSTALL, press the "install image file" button.

Now head to the route where the .img file of the ROM is.

Select it, in the multiple choice menu select "SYSTEM IMAGE" and swipe to confirm installation.

Once finished, reboot to ROM or continue with the steps in order to get Google or Root working.