The solution: just erase the eeprom, it'll load the default settings and boot in English.
It only holds the menu settings.
Your last eeprom dump seems wrong too?
Mine starts with "AA 55" (Also did the UD1200 after erasing the EEPROM) , yours is missing the first byte and lacking the last one in the data block.
If you group the data in 2 bytes you'll see they're 16-bit integers containing the menu data, max power, max temp, etc.
There's a newer UD-1200 with v3.02.02 firmware, it's the same thing but adds fast temperature switching/presets.
The 210s have much newer fw, I wonder if I can overcome the power limit by modifying the fw.
Also, I tried modifying the EEPROM data.
Power limit is byte at 0x0B, it's set to 0x1E(30 decimal) in 210 stations and 0x83(130 decimal) in 245 ones.
Setting this byte to 0x82 in 210 fw effectively unlocks all the power!
There's a catch, if you lower the power in the menu or perform a factory reset you'll lose it.
I'll try to patch the firmware to unlock the power!
This 210 has 2022/06/23 SD-v3.02.04 fw.
Did your 1200 pro and non-pro came with the same fw version?
If so, it should very easy to perform a diff of them and see the differences!