Accidentally flashed the wrong firmware, am I hosed?

I flashed my RM520N-GL with the latest firmware version RM520NGLAAR01A06M4G_01.001.01.001 and it royally messed up my modem. While the firmware “took”, it caused the modem to lose all settings and it won’t save the new settings or connect to the network. After further investigation, I realized this modem was an engineering sample and I’m assuming that’s the issue. I was able to flash back to RM520NGLAAR01A05M4G_01.001.01.001 but any settings I try to save, won’t save. Am I screwed?

Dear @viberama
RM520NGLAAR01A06M4G_01.001.01.001 is used for MP sample.
It is better to book a new MP sample for testing.