Hi jameskuo,
Could you refer to the steps in SMCU update bug on BMC UI update - #8 by KevinFFF to update the following SMCU FW to verify?
P3740_Aurix_StepB.hex (1.3 MB)
If you update it successfully, you should get the following information.
Shell>version
P3740-QS2
with TLF35584 B/C-Step
SW Version 1.50.15
* Rel-36 DP release
TC397 Step BD