CDJ-850 firmware update issues

Hi all.

I just updated 4 CDJ-850s to the newest available firmware version 1.13.

However, since the update, I am no longer able to connect to Serato DJ. I am using the 850s in conjunction with a DJM-900nexus, and I have the Serato DJ club pack activated.

They used to work perfectly fine with this same exact setup in 1.06, now with 1.13 the screen shows "Connected", but won't let me select a deck and does not move anything within Serato DJ.

Does anyone have a fix for this? Or the old firmware versions to downgrade the CDJ?

Cheers