KSGER v2.10 vs 2.1s - what's the difference?

[mb.raghavendra@gmail.com]

https://www.eevblog.com/forum/reviews/t12-stm32-v2-1s-soldering-station-controller-schematic-etc/msg2467236/#msg2467236

All version info are available

Controller board H/W versions:
OLED-V3.0 (black PCB) same as 2.1S but no pump control, 6-pin OLED, no R20 battery killer, ref. designators shuffled, no resistor packs, battery on board, JBC option R0 may be fixed. Looks like a cheaper build.
2.1S (blue PCB) has pump control and buck-converter. JBC option is bungled, I think you must cut a trace.
2.1S (green PCB) has pump control and SPX2954 LDO for 3.3V
2.1  (sometimes called 2.1S) has no pump control and an LDO for 3.3V, not buck-converter.
2.01 fixed the (2.0) LDO overheating, added copper-pour heatsink.
2.0  is a failed design using SOT-89 LDO for 3.3V that overheated from no heatsinking, and no snubber on the MOSFET.
1.5  oddball design using dual buck/LDO vregs, 4-pin GX12 connector like Quicko, and dual op-amp for thermocouple amp. PT Dreamer's Blog reverse engineered it and made custom open firmware for it.

Lately, firmware needs an activation key first run. STM32 CPU ID1, ID2 and then activation codes.