I have just received from the vendor the MIBs for the CAMBIUM ePMP for FW version 2.5.1 and 2.4.2 (renamed CAMBIUM-ePMP-2.5.1-MIB and CAMBIUM-ePMP-2.4.2-MIB)
I put them under the MIB folder
root@T1000:/opt/observium/mibs/cambium# ls -l
total 944
-rwxrwxr-x 1 user user 222338 Dec 2 15:06 CAMBIUM-ePMP-2.4.2-MIB
-rwxrwxr-x 1 user user 215949 Dec 2 15:06 CAMBIUM-ePMP-2.5.1-MIB
-rw-rw-r-- 1 user user 164656 Nov 20 2014 CAMBIUM-PTP800-V2-MIB
-rw-rw-r-- 1 user user 13857 Nov 20 2014 MOTOROLA-PTP-MIB
-rwxrwxr-x 1 user user 121942 Nov 4 2014 WHISP-APS-MIB
-rwxrwxr-x 1 user user 107218 Nov 4 2014 WHISP-BOX-MIBV2-MIB
-rwxrwxr-x 1 user user 3715 Nov 4 2014 WHISP-GLOBAL-REG-MIB
-rwxrwxr-x 1 user user 96040 Nov 4 2014 WHISP-SM-MIB
-rwxrwxr-x 1 user user 2416 Nov 4 2014 WHISP-TCV2-MIB
root@T1000:/opt/observium/mibs/cambium#