If the TPsk506SPB802 uses an STM32 or similar MCU, it may support USB DFU (Device Firmware Upgrade) class.
The standard firmware update procedure uses XMODEM, YMODEM, or a vendor-specific protocol over the USB COM port.
Direct "deep links" to firmware for industrial components are rarely public to prevent unauthorized flashing that could brick the hardware.
To get the correct USB link, you should follow these steps:
Launch firmware tool
Start transfer
Verify CRC – Tool confirms checksum; module reboots into new firmware.
SPB802_BL> usb start
SPB802_BL> loadb 0x81000000
Then use a tool like CuScreen or Tera Term to send the firmware binary via Xmodem or Ymodem. After transfer:
SPB802_BL> erase 0x9f000000 +0x800000
SPB802_BL> cp.b 0x81000000 0x9f000000 0x800000
SPB802_BL> boot
Depending on the bootloader, use one of the following methods: