How to restore backup on TWRP if phone wont start - Android Q&A, Help & Troubleshooting

Hi, I've tried to install new ROM to my phone, however it stuck as per
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(Lingeage OS startup screen).
How can i restore any backup if recovery restart (Volume UP+Power) doesnt work and i can't connect with PC?

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Stuck at recovery mode

My device is hauwei mate 7 it's not rooted and I didn't install anything to it like any other firmwares or something its stuck on recovery mode I click reboot system now and it reboots back to recovery mode I would like to get it working without formatting my device since I don't have a backup please help?
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Samsung G930F no command screen

When trying to install a rom on my phone I've done something wrong and now my phone won't boot properly it just comes with with a blue no command screen. When trying to boot into recovery it won't do it and it does the same thing. When holding down power and volume up button it comes up with this
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No Recovery Patitions !

I am using the lg g8x and want to switch to another custom rom to use. I have done the step of unlocking the bootloader and switched to installing a twrp to install the rom but I can't install twrp. on desktop shows "recovery patition" not found . I switched to recovery mod and the words 'no command' appeared. so how do i partition it and install twrp? thanks.
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General Nokia C21 test point for flashing and frp reset.

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Short the test point with ground and then connect phone to your Windows computer and the phone will show up as COM PORT in
the device manager. Now you can use any tool to wipe data or factory reset the phone.

How install .IMG rom

Hello everyone
how can i install a IMG rom a tablet
the rom is this: https://forum.xda-developers.com/t/9-0-unofficial-dot-os-3-1-gsi-arm-arm64-a64-a-ab.3952035/
thank you for reply. i've test this method now but go in boot-loop. i haven't any boot partition img....
in twrp i haven't a System Image button, i test with fastboot
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"lightbox_new_window": "New window",
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