Why would I need to downgrade A2?
It seems that DJI had forgotten that not all their customers that use DJI A2 FC have the latest GPS pro plus module
Recently I have encountered a problem after upgrading DJI A2 to the latest 2.7 firmware. The GPS pro module started acting and I wasn’t able to arm my multicopter.
After doing some research I have found that this is a well-known problem because the latest firmware requires you to have GPS pro plus module and it cannot work with the regular GPS module that came with the A2 when it was bought.
So you would say, that is easy, just downgrade and everything is back to normal.
That could be done if are keeping previous versions of the Assistant software so you could uninstall the latest and install the one that is compatible with the required firmware.
Unfortunately if you try to find previous firmware versions on the DJI website, there aren’t any. You could only download the latest one. So there is no way to downgrade A2 unless you have an older version of the Assistant software.
I have started searching for an older version of the Assistant software in order to do downgrade A2 and after an extensive search, I have found a link to download the 2.1 firmware – http://download.dji-innovations.com/downloads/a2/A2_1.2_Installer.zip
After the installation, all went back to normal, but I started wondering if I’m forced to use 1.2 version or the link could work for the other firmware version, just by changing one number in the filename. It turned out that all other versions are there,and you can downgrade A2 to any firmware you want, just replace the number 2 in the link with the required version http://download.dji-innovations.com/downloads/a2/A2_1.[enter your number here no brakets]_Installer.zip
Just in case DJI decides to remove the previous versions from their server, I have uploaded the file on 4Shared