Thanks PeteNP, and I have also turned off 'auto updates' for my ipad so it stays at 2.9.1 and I don't update AC or RC firmware anymore as I had issues with AC 1.10.xx and had to roll that back also using the 'debug' method which was a bit nervy.. but worked okay. Been fine ever since.
I do update Litchi however whenever there is something worth installing, or bug fixes. Good luck!