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According to the others is -w option is somehow broken and should be replaced with fastboot erase <partition>, e.g.: fastboot oem unlock fastboot erase boot fastboot erase cache fastboot erase recovery fastboot erase system fastboot erase userdata fastboot flash bootloader bootloader-angler-angler-03.68.img fastboot reboot-bootloader sleep 5 fastboot ...


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Flashing the correct img solved the problem: heimdall flash --RECOVERY TWRP-3.3.1.0_A20_V1.2_by_Agrim720\[Black-themed\].img.img File was found here: XDA-forum Device: A205GUBU4ASK2 Previously rooted with boot.img patched by magisk and vbmeta flashed: heimdall flash --BOOT magisk_patched.img heimdall flash --VBMETA vbmeta.img I highly recommend to ...


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For Heimdal: I refer to the Developers read me file for linux command line instructions: Flashing Firmware from Command Line: 1. Fully charge your phone (use the wall charger as it's faster). 2. Download a decrypted device ROM or a Heimdall Firmware Package and extract everything to the one directory. 3. If the ROM is not a Heimdall Firmware Package ...


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You can always format from command-line to be sure where the problem is (if any). This will erase your whole /data partition which contains personal data, apps etc. Boot to TWRP recovery. Find block device for userdata partition. Usually it's symlinked at /dev/block/by-name/userdata or /dev/block/bootdevice/by-name/userdata. See FINDING BLOCK DEVICE section ...


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If you are flashing ROM, Common causes could be Wrong ROM Battery Failure (Please make sure it is charged fully or upto 70%) Power Off/ Cancelling process in between. Please search for the same Model ROM to Upgrade to current version. Also in Settings, search for Software Update option before trying anything else.


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