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A mid-range smartphone from HTC, released November 2014.

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accidentally OS deleted bootloader unlocked and TWRP recovery install

i have htc desire 820. i decided to root my device, successfully unlocked boot loader and install TWRP recovery and accidentally delete my system files now i am trying to connect from fastboot to install stock recovery so that i can restore my old backup but while connecting to computer fastboot recovery showing me waiting for device, so i visited to service center but they told me to replace motherboard pls help dont know what to do .........

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If you can get it back into TWRP recovery, as @iammjones said, you can connect it to a PC. TWRPs newer versions have an option where you can connect it to a PC and you will see a folder where you can drop files from a computer.

You would then copy a known working ROM into that folder (i.e. Download folder -- if it doesnt exist, create it). Once the copy completes, disconnect the phone from the PC and then use TWRP to navigate to that folder and install the ROM.

For better help on this type of issue see the guys at XDA.

https://forum.xda-developers.com/desire-...

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Check If ADB Drivers Is working correctly or not if not then install compatible usb adb drivers for your pc and try again in fastboot

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A factory rset will me in order. Follow the interactive process here : http://www.virginmobilecanada.com/en/sup... not exactly your phone type, but hopfully it helps

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OP deleted the operating system which included recovery from factory. He also installed custom recovery. There is nothing left of stock to recover from.

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