It features embedded MaskROM and internal SRAM. It does not contain internal programmable flash memory, pulling its operational instructions (firmware) directly from the NAND flash it governs or executing from RAM in boot mode.
You don’t update a Phison controller for “new features.” You update to fix corruption or to perform a after the drive becomes bricked. Here are the classic symptoms that indicate you need a firmware re-flash: phison ps225107ps2307 upd
Updating the firmware of your Phison PS2251-07 or PS2307-based USB flash drive can be a bit tricky, but it's essential to ensure that your device stays compatible with the latest systems and software. Here's a general overview of the firmware update process: It features embedded MaskROM and internal SRAM