I've now made a version with modified interface to the Flash memory chip, which appears to save around 8 or 9mA on the GD77, but only around 3mA on the DM1801.
I don't know how much current it saves on the RD5R, but at least 3mA based on the other 2 radio types
9mA on the GD77 equates to around 10% of the constant current drain on the battery, so is definitely a worthwhile change.
I initially had problems with the changes to the Flash memory access, which prevented some radios being able to read the Flash memory and those radios hung on with CAL DATA ERROR and would not work at all.
About 10 people have now tested a bug fix version, which no longer seems to have this problem.
This version should be considered as highly experimental, and should only be loaded, if you know that there is chance that it won't work, and you may even need to remove the battery to reset the radio.
https://drive.google.com/drive/folders/ ... sp=sharing
But I need to get this version tested by more people before it even makes it to being a Beta, hence why I've posted the files to my google drive.
Note.
The JA versions are Japanese only, and have the Japanese font instead of the normal "latin" / western font
(This is the same as the last version I emailed to Beta testers, and I seems to now work for all of them)