You can test this firmware. This is improved version of edy555 firmware v 0.3.0. It shows battery indicator even if diode is not installed.
Also it shows battery voltage on CONFIG => VERSION screen.
Note that firmware assumes that diode voltage drop is 500 mV, so it adds 500 mV for correction.
PS: this version has si5351 hardware check, so if you see the red PLL indicator under the battery it means that you have defective si5351 chip. Defective si5351 may works unstable above 200 MHz.
In addition, this firmware has bug fixes, better noise floor and more precise measurement.
I recommend you to cleanup settings and perform calibration after upgrade. You can perform setting and calibration cleanup with the following console command:
clearconfig 1234
