Flash Persist in EDL

1. Add this line fastboot %* flash persist %~dp0images\persist.img || @echo "Flash persist error" && exit /B 1 above the last line in flash_all.bat file and save the file
2. Go here https://emn178.github.io/online-tools/crc32_checksum.html and drop your persist.img. Copy the result you get open the 'crclist.txt' file  add 'persist 0x' followed by the value you copied and save the file

<program SECTOR_SIZE_IN_BYTES="512" file_sector_offset="0" filename="" label="persist" num_partition_sectors="65536" physical_partition_number="0" size_in_KB="32768.0" sparse="true" start_byte_hex="0xf4000000" start_sector="7995392"/>

Now find this line in rawprogram0.xml and change filename="persist.img"