Downgrading firmware on P3P from 1.10.9 to 1.7.6

[quaddamage]

Yeah.

For some details, looks like m0900 is the Main Controller Unit on the OFDM board:

P3X OFDM Receiver board · o-gs/dji-firmware-tools Wiki

Tools for handling firmwares of DJI products, with focus on quadcopters. - P3X OFDM Receiver board · o-gs/dji-firmware-tools Wiki

github.com

So my educated guess would be that the MCU sends configuration to transceiver.
The transciever - AD9363 - is listed here:

P3X OFDM Receiver board · o-gs/dji-firmware-tools Wiki

Tools for handling firmwares of DJI products, with focus on quadcopters. - P3X OFDM Receiver board · o-gs/dji-firmware-tools Wiki

github.com

If we follow the link and get its datasheet, there is some info on the attenuation:

And also on how it is set:

So the Python tool must be modifying SPI commands which configure AD9363, by allowing to set the attenuation.

We could even go deeper, checking which registers are responsible for that, and how to set them - that is not directly in the datasheet, but it points to such info:

 

[mj2019]

man , its so complicated!!! i thought itsa parameter like height max, i edit it in note pad then recompile it to a fw then update the p3 (digdat0 method and some of his friends tools on github)!! ill not touch it for nowits beyond my knowledge!!

 

[quaddamage]

i thought itsa parameter like height max, i edit it in note pad then recompile it to a fw then update the p3

What I described above is not how to use it, but how it works inside.
And actually, I skipped the complicated bits.

 

[mj2019]

What I described above is not how to use it, but how it works inside.
And actually, I skipped the complicated bits.

i understand whatu said, actually ur a treasure in this high end technical language, but i need a simple method if any exists to get rid of the attenuation, more power means more robust connection, i dont care for fcc and others no one will check ur power, i will not fly inside an er room or hospital to hurt equipment with my higher few aditional db power i would get,
i need the method of changing this parameter as par digdat0 if that isever possible!!

 

[mj2019]

if the attenuation factor is a parameter so it is possible to do its mod using same method ?

 

[Grumpy]

Thoughts on roll back. I was thinking back to 1.6 which offers the 32 channel hack. With the controller at 2.4.3. Is that not the best option? I see where some went to 1.5 for the increased TX output... but then I see dont use 1.5 due to known bug. Can someone clarify what would be the ideal FW for the aircraft and SW version for the app? Thank you.

 

[mj2019]

hi every one, hope ur all fine. a new challenge if u like to contribute

Dji smart battery replacement attempt

hi every one, since am along some one else who may think that phantom 3 is still air worthy, and since not a lot of batteries are still available for this craft in market or if any is still there the quality or price maybe a concern so i tried to solve this by using our hobby avalable 4s lipo s...

phantompilots.com

 

[syclone50]

Hello everyone, I am not very computer savvy and was wondering if anyone has made a step by step video of the downgrade process. Obviously seeing someone walk you through it is much easier than reading the steps. Thanks