OAI gnB with USRP N310: error: MPM major compat number mismatch

[sonu_johnwick]

We are tying to test OAI gnb using USRP N310 but we are getting this error. We also tried to upgrade USRP firmware to make it compatible with OAI gNB this is where the following error occurred. Any Help would be appreciated.

[ERROR] [MPMD] MPM major compat number mismatch. Expected: 5.3 Actual: 4.4. Please update the version of MPM on your USRP device.
terminate called after throwing an instance of 'uhd::runtime_error'
what(): RuntimeError: MPM major compat number mismatch. Expected: 5.3 Actual: 4.4. Please update the version of MPM on your USRP device.
Aborted

[jjradios]

I'm having the same problem.  I already updated the file system as suggested in other threads.  I even built and installed MPM from scratch hoping that would update the version number somehow.  I can't find any other resources on this.  

[nhedberg]

I found that USRP version 4.8 is MPM version 5.3, so upgrading your USRP to 4.8 fixes it. On an x410 this can be done with: 

# usrp_update_fs -t v4.8.0.0

From the instructions here for the n310 you can update to the 4.9 using 

$ sudo uhd_images_downloader -t mender -t n3xx --yes

based on the Ettus release page there were no changes to the n310 between 4.8 and 4.9.

Hope that helps.