Manual flashing is typically used for "unbricking" a device or downgrading software. This requires specific "Stock ROM" files and flashing tools.
The easiest way to update is through , which handles the download and installation automatically. Navigate to Settings: Open the app and head to System . Firmware TCL 502
Determine if your model uses an MTK (MediaTek) or Qualcomm chipset. MTK devices generally require the SP Flash Tool . Manual flashing is typically used for "unbricking" a