Looks like FrSky has deleted all the older firmwares from their website...even the immediately previous version.

I need one to downgrade an R9Slim+OTA from ACCESS to pre v2.x ACCST.

Thanks...

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Bill

The Slim+ OTA uses the same ACCST firmware as the Slim+ non-OTA, and the last pre-2.x.x ACCST version (which is version 190201) is still available for download on the Slim+ non-OTA downloads page at the following link. So grab it while you still can  

https://www.frsky-rc.com/r9-slim-plus

Thanks very much SnowLeopard. I was wondering if the firmware from the older model would work with the OTA version.

Thanks again.

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Bill

(22-Apr-2020, 01:26 AM)SnowLeopardFPV Wrote: The Slim+ OTA uses the same ACCST firmware as the Slim+ non-OTA, and the last pre-2.x.x ACCST version (which is version 190201) is still available for download on the Slim+ non-OTA downloads page at the following link. So grab it while you still can  

https://www.frsky-rc.com/r9-slim-plus

But I thought OTA variants weren't compatible with ACCST? or am i mistaken?

Several (all?) of the OTA receivers have TWO firmwares...one for ACCST, and one for ACCESS.

If you load the ACCST firmware, I suppose you won't have any of the ACCESS features, with OTA, or over-the-updates, being one of them, but, you'll remain compatible with older transmitters, like my X9D+, which is ACCST.

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Bill

(22-Apr-2020, 01:56 AM)bffigjam Wrote: But I thought OTA variants weren't compatible with ACCST? or am i mistaken?

LOL. Just when you thought you were getting to grips with it all, the tables get turned again  

All the OTA versions of the R9 receivers are backward compatible with the ACCST firmware, and both the OTA and non-OTA versions of the receivers run identical ACCST firmware.

The non-OTA receivers can also run the ACCESS firmware but the ACCESS firmware files for the OTA and non-OTA versions are different because the OTA version has over-the-air firmware update capabilities while the non-OTA firmware doesn't. Other than that, the functionality of the ACCESS firmware is the same on both the OTA and non-OTA versions. Also, you can only run ACCESS firmware on either the OTA or non-OTA R9 receivers if the R9M module you have is the newer "2019" version, and your transmitter is an ACCESS equipped transmitter with an internal ISRM module instead of an internal XJT module.

See how confusing it all is?

And just to add more to the above, I discovered that with the ACCST firmware used on the R9 Mini, R9 Mini OTA, R9 MM, R9MM OTA, R9 Slim, R9 Slim+, and R9 Slim+ OTA, is the exact same ACCST firmware for all of them. The downloaded firmware files for each of those just has a different name, but the firmware file contents are identical.

(22-Apr-2020, 02:40 AM)SnowLeopardFPV Wrote: LOL. Just when you thought you were getting to grips with it all, the tables get turned again  

All the OTA versions of the R9 receivers are backward compatible with the ACCST firmware, and both the OTA and non-OTA versions of the receivers run identical ACCST firmware.

The non-OTA receivers can also run the ACCESS firmware but the ACCESS firmware files for the OTA and non-OTA versions are different because the OTA version has over-the-air firmware update capabilities while the non-OTA firmware doesn't. Other than that, the functionality of the ACCESS firmware is the same on both the OTA and non-OTA versions. Also, you can only run ACCESS firmware on either the OTA or non-OTA R9 receivers if the R9M module you have is the newer "2019" version, and your transmitter is an ACCESS equipped transmitter with an internal ISRM module instead of an internal XJT module.

See how confusing it all is?

And just to add more to the above, I discovered that with the ACCST firmware used on the R9 Mini, R9 Mini OTA, R9 MM, R9MM OTA, R9 Slim, R9 Slim+, and R9 Slim+ OTA, is the exact same ACCST firmware for all of them. The downloaded firmware files for each of those just has a different name, but the firmware file contents are identical.

brb buying a jumper and crossfire