I couldn't find a set of release notes specific to Elevate and the Elevate references in the ePMP 3.5.2 release notes seemed to sparse to be complete.
Are all of the one-off beta support firmwares rolled into 3.5.2?
Are these radios now officially supported in 3.5.2?
One place where you can find list of supported elevate devices is a MIB file for 3.5.2.
Please find it at - https://support.cambiumnetworks.com/files/epmp/ > ePMP System Release 3.5.2 / 12-Jul-18 > CAMBIUM-ePMP-3.5.2-MIB
The file is a text file and the list will be part of the “cambiumHWInfo” MIB parameter.
You can see from that list that Bullet M2 (ePMP Elevate BM-M2-HP-XM) and PBE-M5-400-ISO (ePMP Elevate PBE-M5-400-ISO-XW) are supported.