In retrospect, most failed with the X5. I haven't heard of many trying the roll back with the X5R. Did you succeed with the X5?
Please post your .bin file specifics. I have a pile of .bin files collected from all over the place (before I knew that DJI was messing with them).
I was downgrading with X5R using:
WM610_FC550R_FW_V01.08.01.20.bin - 97,722,756 bytes
and RC 1.6
then I was upgrading the drone to:
WM610_FC550R_FW_V01.08.01.40.bin - 97,824,708 bytes
I did this 3 or 4 times, can't remember exactly but it was always a success. At first it was like it got fixed and the signal was stable when I as walking around my house, but over the time and doing a lot of flights concluded that we still have the silly video breakups and the connection is not reliable as we want it to be, note we are not looking for range but for stability. Then suddenly on one of the shooting days the inspire requested and couldn't complete compass callibration, whatever I tried. I thought it was bricked or the compass unit was damaged. Later at home the only thing left was to try to upgrade the firmware to the latest. When I did that the compass callibrated normally and I let it stay with this firmware as I wanted to feel the difference between the previous installed 1.08.01.40 and the latest but I couldn't notice anything significant and I still keep it with the latest firmware. After that I read here in the forum about DJI altering their previous firmwares to have the new underpowered radio module. I don't remember when and from where have obtained the files I have, but they are most probably from dji site as I still keep some saved links.
When I've finally took an RF measuring device I downgraded again just to measure before and after as I was very curious and there was no difference in RF power measurement with the files I have - 1.08.01.40 and 1.11.01.50.
But thinking some more I'm wondering is it actually the downgrading of the RC to v1.6 the key to success? I've had the RC downgraded to v1.6 only on the first downgrade, on the rest downgrades I fount that the RC was working fine with v1.7.8 and 1.08.01.40
Some time ago I have found some info about module names after decompiling the inspire/phantom firmware, it was more like phantom related topic but now I can't remember where was that. If someone can tell what is the name of the radio module I can decompile several FW versions and compare their radio modules to see if they are all the same.