Repair Jlink V9 Firmware small note

Online bought a cottage jlink V9.3 Plus, known not to lose firmware, but the firmware eventually fell, the phenomenon is: plug up red light, found Jlink but the driver can not install. It is estimated that the firmware is missing, put G search a lap found repair firmware are V8, but found the V9 schematic and V9 firmware, although is not with bootloader, can not upgrade, first all under the study.

See the J1 four pins from the schematic diagram

stm32f205 46 and 49 of the SWD foot

Open Jlink, found on the board of the J1, see is my board only left out of these 4 points, no pin, on hand there is no Jlink 4-wire plug. Online to find a jLink20 Pin interface diagram:

Find the 4 heel line and direct solder on OK. 1:4,2:9,3:7,4:1, respectively.

Finally find a good jlink brush into, V9 finally back to the dead.

Another: Jlink V9 schematic and firmware are from 21IC, there is an Ah Mo forum seems to have upgradeable firmware, but registered to 60 yuan, which has an account, secretly told me Ah, lend me to download, ha

Repair Jlink V9 Firmware small note