[Mate 8 General] Dioky:
Close call...

Hi,

Just to share with you all my close shave I just experience with my NXT-AL10.

I was on Simply Google B172 custom ROM when I decided that I had to get back on par with the B3xx versions and decided tot update.

After extensive reading and searching (there isn't a explicit guide on how to upgrade from B1xx to B3xx. and what is to be found isn't always congruent) I made the jump.

Here is how I went:

- back to stock ROM B182 with help of the guide in OP, Huawei's UpdateExtractor and Italian Knife.

It was at this time, that I noticed my phone wouldn't recognize the Volume- & Power action to reboot into bootloader. I used Italian Knife to bring me to bootloader.

- updated to stock ROM B331 using DLOAD method (everywhere is written it has to be on Internal Storage) like guide in OP again.

- unlocked bootloader again with fastboot, again with Italian Knife to help me to bootloader mode.

- did full wipe and Format Data

- used SRKTool to flash TWRP for EMUI 4.1

- flashed TwistedMate B361 with TWRP.

Now problems really started building.

I noticed that every time I flashed the custom ROM, I got the error:

"failed to mount /dev/block/platform/hi_mci.0/by-name/userdata at /data: Device or resorce busy"

So I gave it another try, over and over again with different TWRP's from SRKTool and the ones found in the Mate 8 threads here.

I just ended up with another error in the log:

failed to mount /dev/block/platform/hi_mci.0/by-name/cust at /cust: Device or resorce busy

That got me worried, because the Cust is a vital partition.

But since the ROM seemed to be working I went along installing my apps and so.

By that time I began running into problems like USB debugging mode wouldn't stick. It went off as soon as I left the Developers Options from Settings. Or I lost some settings after a reboot. Or the file transfer mode over USB wouldn't work.

So I decided somewhere in the upgrading process, something must have gone wrong and did it all over again.

Like described in OP, I tried to flash back Stock B182.

Shouldn't have done that. It softbricked my Mate quite dramatically, with nothing working anymore and stuck in that bootscreen that says the device isn't secured and that it starts booting. With no possiblities to connect the Mate to the PC since it wouldn't be found, ADB didn't see any devices and no way of getting into bootloader...

The only thing that kept me hoping was that the 3-button reset came up with Huawei's eRecovery screen (with lots of Chinese characters) that seemed to want to connect to my WiFi router. Although it only returned yet more Chinese characters and a big red exclamation mark. All other rebootings kept me in the 'this device isn't secured bla bla' screen. And believe me, I tried hard!

After searching the internet I found that on other Huawei devices, the DLOAD mode could work from an external SD card.

So finally, I downloaded the stock B331 unzipped the Update.app, copied it on an empty micro SD card, into the phone and 3-button (Volume up & Volume down & Power)...

Update worked!! :highfive:

Phone is back in business :laugh: and updating OTA to B352 as I write.

To enter fastboot still isn't possible with Volume Down an Power, but it does os with powered down device and keeping Volume Down while connecting the USB cable.

Will be trying to update to custom ROM shortly ;)

Still got that error "failed to mount /dev/block/platform/hi_mci.0/by-name/userdata at /data: Device or resorce busy" in TWRP log. But Mate 8 is working without problems so far :D

***EDIT***

Cheered too early:

Still got problems like: Clock app FC-ing all the time, Camera app FC's when trying to go into panorama mode, when connecting to PC Mate 8 automatically goes into File Transfer mode but won't do just that unless button is manually switched off/on again. Maybe some more that I haven't found out yet.

Regards,