[Q] i need help plz - Android Q&A, Help & Troubleshooting

i have a china tablet its name is good voice 7" v79
one day when i use( android system recovery e3 ) for do wipe data/factory reset
then i do it but i turned the power off after 1% of the process , now the tab. cant boot
and when i try to do wipe again a message is appeared ( E : failed to mount /system (invalid argument)
and its stuck at the splash screen

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I have problem with my 6030x, because I loaded it all night and after i woke up telephone was off, then i try to run it and it stuck after android logo (black screen. bootloop?). I have TWRP recovery , but when i try to backup TWRP say "
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Problemes after he samsung galaxy 6.3 Gt-i9200 Root { Please Help Me ! }

I have a Samsung galaxy mega 6.3 (GT-19200), I had vcoreroot router with {VcR00T} and since my phone does not turn and remains blocked on the Samsung logo
I tried all the links to this problem but nothing, the logo is still there, but I have little unrooter with Odin and firmware and the phone still blocked on the samsung logo
In the links, we wonder just reset the phone in RECOVERY mode.
When I put the phone into Recovery Mode I find myself with too bizarre entries:
E: failed to mount / data (invalid argument)
can not mount '/ data' (invalid argument)
E: Failed to mount / data (invalid argument)
E: Can not moun /data/log/Recovery_log.txt
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note 2 stuck on samsung logo

Hi,
Today I found that my Samsung Galaxy Note II (GT N7105) was stuck on the samsung logo which comes on startup. I restarted it but it still wasnt going beyond the logo screen. After that I went into recovery mode by pressing power, home and volume up button and it showed some messages like this:
E: failed to mount/efs (no such file or directory)
E: failed to mount/system (no such file or directory)
E: failed to mount/cache (no such file or directory)
E: cant mount / cache / recovery / last_recovery'
E: failed to mount/data (no such file or directory)
And many messages like this. I would upload a pic but I dont know how to upload it here.
After doing factory reset and wipe partition, it still stuck on the samsung logo.
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i m a newbie. pl show step by step how to get my phone working. Please help.
Thank you.

Samsung S 3 stuck on recover mode E:failed to mount /efs error how to fix, HELP!!

I need your help
My problem started with lock pattern freezing even it was correct,
I enters the recover mode and wipe the cache I found myself in other problem
E:failed to mount /efs
E: can't mount cache\ data
Now my phone stuck on recovery mode & download mode the startup logo freezing.
More details " stock rom with unrooted device
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HI GUYS!
I have a problem with my Samsung S9+ , while it stopped at a sudden and started to have a loop restart and then i got to the recovery mode i did wipe cache on the beginning and restarted but it went for loop restart, then i did factory reset and again loop start .. so then i went to the bootloader to install a firmware via Odin3 i did it and then when it finises and the phone reboot it come back to the recovery mode and show on the screen down that "failed to mount/data"(invalid argument) failed to resizing-data ..
knowing that i cannot go on the phone to do ADB the phone is only loop restarting ..
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