Sierra Wireless EM7455 Embedded Module is an LTE Cat 6 SWAP to EM9191 in a FUJITSU 939X?

[jyijyi]

you might need to check for a number of pin voltage:

EM9191 not found in LattePanda3Delta m.2Bkey slot

We also tried a wide variety of adapter boards with no luck. EM9191 still works great in the Sierra DevKit board. Tried adding pullup to 1.8V on the adapter boards too. I measured the various signals and have not yet found the issue. I have built a schematic using the devkit manual schematic. Do you have any more suggestions? Is there a reference design package to make our own PCB?