Installing custom ROMs can void warranty, brick your device, or cause data loss. Backup everything (photos, contacts, OTPs, etc.). Proceed only if you understand risks.
Download your chosen ROM and the appropriate GApps (Google Apps) package if it is not already included. Boot your Realme C30 into Custom Recovery mode. realme c30 custom rom
LineageOS: The gold standard for stability. LineageOS provides a clean, bloat-free experience that stays true to "Stock Android" while adding essential power-user features. Realme C30 — Custom ROM guide (concise, practical)
fastboot oem unlock (or vendor-specific command)