Hi,Most of the RM520N-GL modules in circulation are working in USB mode. The Spitz AX router works in Pcie mode. It is possible that this difference is causing your 5G module to not work on the Spitz AX 4G router.please check your model,As picture below.
AA: Supports Pcie and USB
AP: Support Pcie Only
If you are AA. Can try to change to Pcie.
1 Like