Running the SWOS 2.10 firmware upgrade on a internet connected CRS328-24P-4S+RM (SWOS 2.7 Fri Dec 15 2017 09:44:02) as advertised via its own webinterface leads to a newer 2.7p release but not the promised 2.10 release!
The "p" version of 2.7p is build at 09:44:16 instead of 09:44:02, however after the firmware upgrade/reboot the switch still advertises the 2.10 version as a available upgrade from its webinterface but it keeps installing the 2.7p version!
WORKAROUND:
Manually download the CRS328-24P-4S+RM SWOS 2.10 firmware file from the Website and browse&upload the file manually via webinterface and than perform the firmware upgrade.