Procedure to how to flash the Recovery into Umidigi F1_Play
Now is not possible to flash the recovery throught flashtool because there is a bootloader locked so we must go ahead with adb command.
1) download all the previous files;
2) in Android S3 Pro in "Settings System details" enter in about phone ot make visible the developer options click several times on about phone ....
3) in Setting System will be now shown the developer menu' enter and switch to visible OEM unlocking allow the bootloader to be unlocked.
4) reboot the phone and with power menu' and volume + in the same time enter in booting menu'.......select fastboot mode.
5) Now in windws pc run the commad cmd or open a ms-dos window and enter in the adb folder ;
6)write the command fastboot devices...and the phone connected with the usb cable must answer the command that is connected..
7) use the command fastboot oem unlock
o
Fasboot flashing unlock and wait checking the device screen....
8) copy with windows command the recovery twrp.img in the adb folder and renamed it with recovery.img
to flash in the phone use this command : Fastboot flash flash recovery recovery.img
the process will start ...and wait it...
9) make this command to reboot into recovery mode: fastboot reboot.
10) now take the buttons pushed with power menu' + volume + and select recovery mode....
11) in recovery mode will show probably russian language...skip the alert with the arrow back and enter in details menu' on the right top to change the language...
NOW NOT REBOOT INTO ANDROID SYSTEM WITHOUT MAKE THE ROOT STEPS
because the android system protection will flash automatically the recovery original and all of you will lost the recovery twrp flashed before
and all of you will repeit all the preious steps again