./adb reboot bootloader
./fastboot.exe oem unlock
./fastboot  -S 300M flash recovery open_gapps-arm-8.1-pico-20190525.zip

Sending 'recovery' (107081 KB)      OKAY [  3.681s]
Writing 'recovery'                  FAILED (remote: 'image too large for partition')
fastboot: error: Command failed

./adb reboot revcovery