Some units come with a pre-installed app called "System Info" or "About Device". Look for "LCD Type" , "TP Type" , and "MCU Version" . Write these down. The best firmware matches your MCU version.
Based on months of user reports and my own testing, these are the current top 3 stable builds: 8227l Android 10 Firmware Download --BEST
A clean firmware flash is only half the battle. To truly optimize your 8227L unit: Some units come with a pre-installed app called