jason0110
Hello there,
The LK_V07 model you inquired about is suitable for your machine.
However, if SER7 7840 updates the BIOS to V07 version, it will not be possible to revert to the BIOS version V30.
We suggest that you could first try updating the BIOS file of V38 to see if it can solve the problem.
I have sent the BIOS file to you via private message. Please check your messages.
Have a nice day~