Can recover data/restore factory rom via adb/fastboot/PC only (w bootloader locked)?

xabibi

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in brief:
the data should be there on the phone, so there's hope it should be easier to recover than deleted data but i run out of ideas how to get adb to find and pull it... maybe a more advanced user has better knowledge (better commands or tools)
adb devices and fastboot devices communicate with phone, so i have all drivers installed, i can only tackle with it via usb from windows 7 based computer

the detailed story:

i have a huawei g620s-L01, stuck in bootloop and also "volume down" button does nothing... the bootloader is locked and huawei seems to have stopped providing unlock codes...the touch works but is shattered so i was told repair the button is not an option...

i can boot it into recovery mode using "volume up + power" but i can't use the recovery menu due to the dead "volume down"

from recovery menu i can only "reboot system now" but that re-enters the bootloop,

also i get bootloop if i try to boot into download mode via adb command

i can use some adb commands (i say some because some return errors, others say i don't have permissions)

i can boot into fastboot via adb command too...i can not find my dcim folder or any data folder to use the pull commnad, i tried the generic commands to pull sdcrd or dcim or all files with *.jpg

the user data is not accesible, i could browse some system directories but they did not contain my files via cd commands

i found some threads saying maybe i need mount or root commands
but trying to mount partitions or access su via adb also gives errors

su is not found, i do remember there was a su when android was working on the devices but is useless if i can't find/access it

i found the factory rom and some tools to try to restore rom to the phone due to claims that same rom might find my data, but the tools failed to start due to locked bootloader

i also tried several versions of full android sdk (old and new) trying to find "monitor or file browser" tools but the menu is not there...perhaps it will not activate those tools when device is in fastboot/recovery modes :(

i also found a 3rd party full android browser but can't connect with it either

also recovery softs are useless, they need a working android to try to recover anything...some recovery softs claimed they can fix bootloop but don't support my device

free tools that try to unlock bootloader also failed

so at this point i am running out of things to try
 

xabibi

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thanks, i have thought of them too but was put off noticing some threads are very old and still have no reply https://prnt.sc/1tndxdj
i followed your advice and made a thread there too anyway, perhaps it will improve my chances to find a quick solution from either side

as for the issue at hand i can add one more detail (not sure how important may be):

when stuck in bootloop phone is just loading huawei logo forever or until battery empty but does not restart
 

mustang7757

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thanks, i have thought of them too but was put off noticing some threads are very old and still have no reply https://prnt.sc/1tndxdj
i followed your advice and made a thread there too anyway, perhaps it will improve my chances to find a quick solution from either side

as for the issue at hand i can add one more detail (not sure how important may be):

when stuck in bootloop phone is just loading huawei logo forever or until battery empty but does not restart
Sounds like need to flash the firmware again but I'm not familiar with Huawei to help guide you , maybe search the forum at xda your model number and see if have threads on it
 

xabibi

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before the bootload issue the phone was working fine but it was running out of space, i tried to connect it to transfer but i could not see my files, the drives showed but they were empty, the files were fine on the phone...this error i had some time before but was fixed with the restart...this time i tried to restart and it failed to start anymore...
i was not able to flash it due to bootloader locked and due to button failure i can't sideload from sdcard either or factory reset
can't select the menu

guess taking it to a service might be the only option
i would have done it already but that is likely more expensive than getting another sh one,
and with the button issue and screen shattered is likely not to live too much anyway to be worth the trip

will keep looking for new ideas to try
 

xabibi

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this is what i figured so far: i can see my data but can't touch it :(
i seem to have 4 partitions on the device:


1 is called sdcard but has nothing accesible on it, could be the feature for external card
2 is called ext , total size is 711,49mb , used 124,98 and available 586,5
3 is called system , total size 1,64 gb, used 1,23gb, available 418,1mb
4 is called data, total size 3,96gb, used 3,75gb, available 218,16

clearly the data partition is still keeping my data

i can not see my installed apps, so i guess they are also on that partition

i can see some system apps, namely 49 out of 146

so i'm guessing the issue is with one application, likely system app since i can't see them all

the phone may be partly rooted, the android may have some rooted features but the adb on it is not rooted
so i can not use the adb root command to get to my data
and i can not try to flash recovery or rom or custom boot img from adb due to bootloader locked and asking for unknown code
 

mustang7757

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I would still try XDA and try ping someone there because your in a bind now with device being rooted your only hope someone their can reply and help . Im pretty sure your not going save any data but hopefully get the device back up, your bootloader has to be unlocked if you rooted and installed Super User. Im surprised you dont back up things regularly to cloud or pc and recommend you doing so going forward after this.