PrusaLink not working with firmware upgrade
After upgrading my firmware to version 6.0, my MK4 won't connect to my network. After trying a number of times (including re-flashing) I was able to solve the problem by downgrading back to firmware version 5.13, which works fine. I am using plain WPA2 (Not WPA3 or WPA2 transitional) with a Netgear Nighthawk R7000 router.
RE: PrusaLink not working with firmware upgrade
I'm running the update right now... a little nervously seeing your post!
It's asking to flash the ESP-32 Wi-Fi module, too. Did you see a message like that?
After it finished updating everything, it looks like we also have to re-enable the Network in Settings. Did you notice that?
Once I did that, it did reconnect to my router (Synology RT2600ac, using WPA2/3 personal) which has a DHCP reservation set for the printer's MAC address. Looks like all is well for me.
RE: PrusaLink not working with firmware upgrade
I don't recall seeing a message to reflash the ESP-32 module or asking to re-enable the network when I updated. However, I did both those things several times as I ran through all the steps to enable the wifi and login to the network. Nothing worked until I rolled back the firmware.