F5 Firmware upgrade path from 10.2.4 to 12.1.2 HF2

Hello Manik,

Yes you can upgrade directly from 10.1.x - 10.2.x to 12.x. check this

https://support.f5.com/csp/article/K13845

You can also refer to this article before upgrading (it lists in 7 steps what you have to do before upgrading)

https://devcentral.f5.com/codeshare/7-steps-checklist-before-upgrading-your-big-ip-1053

Hope it helps

Regards