ATS-20+ (PLUS): Firmware update from V2.0.4 to V3.0.7g

I purchased ATS-20+ (PLUS) from AisLu Hifi Store via AliExpress.
Price was 5103 JPY and it arrived in two weeks after the order.
https://ja.aliexpress.com/item/100500...

Installed sketch by seller was V2.0.4.
I updated the sketch to V3.0.7g (ATS-20_bat_mod v2) by VE3XLT, CA2PEY and PU2CLR, which is my favorite sketch.
The update process was easy and took only a few minutes.

Link to the sketch V3.0.7g (ATS-20_bat_mod v2) by VE3XLT, CA2PEY and PU2CLR
https://github.com/patomoi/ATS-20-Sta...

If you would like to update sketch of your ATS-20 receiver yourself, I recommend learning about Arduino first. Then, I suggest you follow the instructions by Ricard Caratti linked below and use sketch in his Github pages. Once you get the hang of it, it would be easy to install sketches published on other sites also.

"Firmware Update via Desktop Arduino IDE" by Ricard Caratti
https://github.com/pu2clr/SI4735/tree...

SI4735 Library for Arduino by Ricardo Caratti (PU2CLR)
https://github.com/pu2clr/SI4735