You do not have to flash an entire heavy firmware file. If only your recovery is corrupted, you can isolate and flash just the recovery.img .
To use Rk Android Tool V2.7.1, you need a proper setup. Rk Android Tool V2.7.1
Supports flashing unified update.img files via the Upgrade Firmware tab. You do not have to flash an entire heavy firmware file
What (e.g., RK3328, RK3229) does your device use? Rk Android Tool V2.7.1
Click the path box next to the checked item and select the corresponding .bin file.
: This version includes a config.ini file that allows users to switch the interface language (e.g., from Chinese to English) by modifying the Selected parameter.
Are you trying to or simply upgrading the firmware ?