Failing to install HF10 on 10.2.4

are you still running partitions on your 10.2.4 installation?

then hf9 and hf10 won't work and you have to request an engineering hotfix.

when you do that please complain at F5 for not clearly documenting this :)

reference: https://devcentral.f5.com/questions/upgrade-big-ip-ltm-6400-to-1024-hf9

if you are already running volumes then it might be a disk issue, i would open a support case.