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Stage 2 is not JB4
BMS Stage 1 came first
BMS Stage 2 came after
JB4 BETA is current one
The BMS S1 and 2 don't have any functionality besides BSF and Wastegate position for more boost. BMS did not name them in accordance with their typical JB line because of the lack of functionality. Which is why they introduced the N63 JB4. Terry from BMS discusses this on the BMS N54tech forums under the N63 development thread.
JB4 can automatically delete CEL codes; guys over at the M5 forums use it for that purpose. Not sure on the JB4 N63, I think a firmware update was released to support this.
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