HTC One the most Popular Custom ROM is now Available For Your Walton Primo F4.
Enjoy this ROM.
How to Install? 1) You have to have a Rooted Phone and CWM Installed. 2) Click Here For Downloading the Zip File. [ROM LINK] 3) Go to CWM Recovery Mood ( Power Off your Phone and then Press Power Button + Volume Down Button untill The Recovery Open) 4) You Can Backup your Stock Rom ( CWM> Backup & Restore > Backup ) 5) Now Follow This steps: i) wipe data/factory reset