Problem with unbricking CH32V003J4M6 using WCH-LinkE

[xinaovo]

Hi there! I compiled and uploaded the template code(which uses the debug pin PD1) to the MCU and I found that I couldn't upload other code to the MCU any more. So I tried to unbrick it using command minichlink -u but it stuck at Connection starting for a while and failed. The log is shown below.

minichlink -u
Found WCH Link
Entering Unbrick Mode
Connection starting
Programmer wasn't initialized? Fixing

DMStatus After Halt: /0/ffffffff
Fault on op (DMABSTRACTS = ffffffff) (-1) (Other Error) DMSTATUS: ffffffff
Unknown chip type.  Report as bug with picture of chip.
Vendored: ffffffff
marchid : ffffffff
HARTINFO: ffffffff
Chip Type: 0
Fault on op (DMABSTRACTS = ffffffff) (-1) (Other Error) DMSTATUS: ffffffff
Unknown chip type.  Report as bug with picture of chip.
Vendored: ffffffff
marchid : ffffffff
HARTINFO: ffffffff
Error: Flash is not unlocked (CTLR = ffffffff)
Error: Flash is not unlocked (CTLR = ffffffff)
Error: Flash is not unlocked (CTLR = ffffffff)

However, after reinstalling the WCH vendor driver and using "Clear All Code Flash-By Power Off" in the WCH-Link Utility, the MCU was unbricked successfully.

btw, the connection between MCU and WCH-LinkE programmer as well as the version of WCH-LinkE and WCH-Link Utility is shown below:

WCH-LinkE > CH32V003J4M6
SWDIO > Pin 8
GND > Pin 2
3V3 > Pin 4

WCH-LinkE version(reported by minichlink): 2.15
WCH-Link Utility version: 2.30

[roboticboyer]

See here the procedure/trick with minichlink -u (required a power off)