[Huawei Mediapad M3 Questions & Answers] xdaens:
Yes i saw there was only the dload folder.

This is what i did so far: copied the dload folder to sdcard

Used Huawei extractor to extract RECOVERY.img

Used adb to « adb reboot-bootloader »

Used fastboot to

fastboot flash recovery RECOVERY.img
fastboot reboot

holding both vol+ and vol- it enters the stock recovery

an update was detected, for some reason it stuck at 5%, then after 5 minutes it automatically rebooted, nothing was erased, i am still on the same version.

at this point i will try to use the update menu using the *#*# code.

edit: using the *#*#2846579#*# menu instead of directly entering recovery mode was successful at installing the dload package.

It rebooted, and strangely nothing was erased. Anyway when i check in « adb reboot-bootloader » the tablet is OEM locked again, and when i try « adb shell » then « su » it's not working anymore, so my bet is that the dload just overwrote the files without formatting, and by doing so unrooted and relocked the tablet, which is what i wanted to continue the nougat install.

now i will try the firmware finder method with the safe path: B009->B010 ->B301.

edit: the firmware finder method is not working (the B010 is stuck at 5%, which is the begin of install process after unpack, and now i am waiting for the auto reboot because if you try to manually reboot you get a red text warning), i used the manual recovery mode (vol +, vol-) as stated in firmware finder, my bet is that this method is somehow broken, i will try an hybrid method (using the ff to get the dload in internal sdcard, then moving it to external sdcard then the *#*#2846579#*# method)

edit: my hybrid method did not work, actually it did not stuck at 5% and installed correctly at 100%, but when it rebooted i can still see BTV-DL09C100B009... maybe there was an error at the end of the install but i could see nothing because it rebooted right after the end of installation.

i am forced to skip the B010 version and now i will try to go directly for nougat, wish me luck... (it's been 3 hours since i started :/ )

edit: i am still downloading, i guess i will continue tomorrow… in the mean time i noticed FF announced 200MB for B010, but in the end the dload/update.app is only around 75MB, maybe something is wrong with the download or even the source file, this may explain why it did install but nothing changed.

edit: this morning, i tried to apply the first update.app using the #*#* menu, at 100% it says « install failed » then it reboots, and strangely it looks like the update actually worked (now boot animation, system optimization at first boot, nougat works and my apps and data are still here!). So, when i have no error it fails, and when i have a fail error it works haha. strange thing, my build version now says « NRD90M test-keys ».

now i will try to apply the « update.app » from the data part

edit: sounds like the neverending story haha, now the *#*#2846579#*# is not working anymore into nougat, it does not open the hidden menu… will try in manual mode

edit: as manual mode require dload to be on internal instead of external sd, i tried to copy the files but the tabel refused to copy some .so files…

for now i wonder what i miss not applying the data part, as for now my tablet is functional in nougat (the split screen resize works so well!) and i even still have all my data and apps installed… i will try to use it like that for a few days, i will give feedback here.

edit: nougat is working fine, BUT bluetooth… it won't activate. as often use it i guess this is not the end of the story, i will try several other things now. something is really wrong because when i try the factory reset, at the end of process (in recovery) it says reset failed…