Hello I am working on a setup consisting of the X4SIP02 and the X4A02 modules. I have implemented the x4driver from XEP into my setup and is able to read/write the debug register (0x04) over SPI. My problem is accessing the PIF registers. When trying to access PIF with the driver it polls SPI_MB_FIFO_STATUS, returns 0x91 for a while then returns 0x00 and eventually times out. I have tried to upload 8051 firmware supplied with XEP but verification fails. The enable pin is connected to a 3.3V supply. All gpios’s are unconnected. Any suggestions on what i can do to access the PIF registers successfully? Thank you.