Failed to unprotect on CH32V203

[wbchn]

I try to unprotect CH32 before flash it, but after run config unprotect, the chip still protected:

$ wchisp -s -p /dev/cu.usbserial-0001 config unprotect
17:07:43 [INFO] Opening serial port: "/dev/cu.usbserial-0001" @ 115200 baud
17:07:44 [INFO] Code Flash unprotected
17:07:44 [INFO] Device reset

$ wchisp -s -p /dev/cu.usbserial-0001 info
17:07:47 [INFO] Opening serial port: "/dev/cu.usbserial-0001" @ 115200 baud
17:07:47 [INFO] Chip: CH32V203C8T6[0x3119] (Code Flash: 64KiB)
17:07:47 [INFO] Chip UID: CD-AB-90-D7-E1-BD-3E-41
17:07:47 [INFO] BTVER(bootloader ver): 02.70
17:07:47 [INFO] Code Flash protected: true
17:07:47 [INFO] Current config registers: ff003fc000ff00ffffffffff00020700cdab90d7e1bd3e41
RDPR_USER: 0xC03F00FF
  [7:0]   RDPR 0xFF (0b11111111)
    `- Protected
  [16:16] IWDG_SW 0x1 (0b1)
    `- IWDG enabled by the software, and disabled by hardware
  [17:17] STOP_RST 0x1 (0b1)
    `- Disable
  [18:18] STANDBY_RST 0x1 (0b1)
    `- Disable, entering standby-mode without RST
  [23:22] SRAM_CODE_MODE 0x0 (0b0)
    `- CODE-192KB + RAM-128KB / CODE-128KB + RAM-64KB depending on the chip
DATA: 0xFF00FF00
  [7:0]   DATA0 0x0 (0b0)
  [23:16] DATA1 0x0 (0b0)
WRP: 0xFFFFFFFF
  `- Unprotected

if flash when the chip is proteced, i'll get an verify error:

$ wchisp -s -p /dev/cu.usbserial-0001 -b Baud115200 flash firmware.bin
17:06:53 [INFO] Firmware size: 44032
17:06:53 [INFO] Erasing...
17:06:53 [INFO] Erased 44 code flash sectors
17:06:54 [INFO] Erase done
17:06:54 [INFO] Writing to code flash...
█████████████████████ 44032/44032
17:07:01 [INFO] Code flash 44032 bytes written
17:07:01 [INFO] Verifying...
Error: Verify failed, mismatch

I also try to using config reset, but the chip still on protected.

$ wchisp -s -p /dev/cu.usbserial-0001 config reset
17:13:11 [INFO] Opening serial port: "/dev/cu.usbserial-0001" @ 115200 baud
17:13:11 [INFO] Current config registers: ff003fc000ff00ffffffffff
17:13:11 [INFO] Reset config registers:   a55aff0000ff00ffffffffff
17:13:11 [INFO] Config register restored to default value(non-protected, debug-enabled)

Is there something wrong with my usage? How to unprotected code flash on CH32V203C8T6?

[Thom-de-Jong]

I'm unable to reproduce this on my chip, even after writing your config bytes to it.

Is it a new chip you are using?
Could you try to program using the official WCHISPTool and share what happens?

[wbchn]

chip is CH32V203C8T6.

Finally, successfully programed it with WCHISPTool on Windows.

[Thom-de-Jong]

Are you now able to program the CH32V203C8T6 using wchisp?
Maybe after the WCHISPTool unprotects the chip, wchisp is also able to program it.