Connecting to J-Link...
J-Link is connected.
ERROR: Error while loading flash algo ELF file. No file specified
Failed to set device (STM32G0B0RE). Unknown device selected?ERROR : Failed to set device.

搜索如何添加flash 编程算法

搜索后缀.FLM 

在jlink目录复制
STM32G0Bx_512.FLM
结果仍然不可以。
虽然在JLinkDevices.xml
添加如下代码后jlink可以连接，但是下载仍然无法下载，因为无法load flash algo ELF file

  <!-- STM32G0 -->
  <!--         -->
    <Device>
  <!-- This entry will overwrite the existing device entry in the J-Link software, so that a custom flash algorithm is used for the internal flash -->
    <ChipInfo Vendor="ST" Name="STM32G0B1RE" WorkRAMAddr="0x20000000" WorkRAMSize="0x20000" Core="JLINK_CORE_CORTEX_M0" />
    <FlashBankInfo Name="Internal Flash" BaseAddr="0x08000000" MaxSize="0x00080000 " Loader="./STM32G0Bx_512.FLM" LoaderType="FLASH_ALGO_TYPE_CMSIS" />
  </Device>  
    <Device>
  <!-- This entry will overwrite the existing device entry in the J-Link software, so that a custom flash algorithm is used for the internal flash -->
    <ChipInfo Vendor="ST" Name="STM32G0B0RE" WorkRAMAddr="0x20000000" WorkRAMSize="0x20000" Core="JLINK_CORE_CORTEX_M0" />
    <FlashBankInfo Name="Internal Flash" BaseAddr="0x08000000" MaxSize="0x00080000 " Loader="./STM32G0Bx_512.FLM" LoaderType="FLASH_ALGO_TYPE_CMSIS" />
  </Device>    

Jlink 不能识别STM32G0B1 系列单片机

这种情况，Jlink 驱动是独立安装的。从Segger 官网下载最新的Jlink （目前是V7.50a），安装后，即可以识别。
安装之后可以跳转识别。

附录

Vscode 报错终端打印信息

Command line: -singlerun -nogui -if swd -port 50001 -swoport 50002 -telnetport 50003 -device STM32G0B0RE -rtos GDBServer/RTOSPlugin_FreeRTOS.dll
-----GDB Server start settings-----
GDBInit file:                  none
GDB Server Listening port:     50001
SWO raw output listening port: 50002
Terminal I/O port:             50003
Accept remote connection:      localhost only
Generate logfile:              off
Verify download:               off
Init regs on start:            off
Silent mode:                   off
Single run mode:               on
Target connection timeout:     0 ms
------J-Link related settings------
J-Link Host interface:         USB
J-Link script:                 none
J-Link settings file:          none
------Target related settings------
Target device:                 STM32G0B0RE
Target interface:              SWD
Target interface speed:        4000kHz
Target endian:                 little

Connecting to J-Link...
J-Link is connected.
ERROR: Error while loading flash algo ELF file. No file specified
Failed to set device (STM32G0B0RE). Unknown device selected?ERROR : Failed to set device.

Firmware: J-Link V9 compiled May  7 2021 16:26:12
Hardware: V9.30
S/N: 59300616
Feature(s): RDI, FlashBP, FlashDL, JFlash, GDB
Checking target voltage...
Target voltage: 3.36 V
Listening on TCP/IP port 50001
Connecting to target...
Connected to target
Waiting for GDB connection...Connected to 127.0.0.1
Reading all registers
Read 4 bytes @ address 0x1FFF5BA4 (Data = 0x47804801)
Read 2 bytes @ address 0x1FFF5BA4 (Data = 0x4801)
Loading RTOS plugin: GDBServer/RTOSPlugin_FreeRTOS.dll...
RTOS plugin (API v1.0) loaded successfully
RTOS plugin: Loaded
Received symbol: pxCurrentTCB (0x20001A2C)
Received symbol: pxReadyTasksLists (0x20001A30)
Received symbol: xDelayedTaskList1 (0x20001AD0)
Received symbol: xDelayedTaskList2 (0x20001AE4)
Received symbol: pxDelayedTaskList (0x20001AF8)
Received symbol: pxOverflowDelayedTaskList (0x20001AFC)
Received symbol: xPendingReadyList (0x20001B00)
Received symbol: xTasksWaitingTermination (0x20001B14)
Received symbol: xSuspendedTaskList (0x20001B2C)
Received symbol: uxCurrentNumberOfTasks (0x20001B40)
Received symbol: uxTopUsedPriority (0x2000040C)
Received symbol: uxTopReadyPriority (0x20001B48)
Received symbol: vPortEnableVFP (0x00000000)
Received symbol: FreeRTOSDebugConfig (0x00000000)
All mandatory symbols successfully loaded.
Received monitor command: halt
Halting target CPU...
...Target halted (PC = 0x1FFF5BA4)
Received monitor command: reset
Resetting target
Downloading 184 bytes @ address 0x08000000
Downloading 16032 bytes @ address 0x080000C0
Downloading 16032 bytes @ address 0x08003F60
Downloading 15984 bytes @ address 0x08007E00
Downloading 16000 bytes @ address 0x0800BC70
Downloading 6248 bytes @ address 0x0800FAF0
Downloading 5456 bytes @ address 0x08011358
Downloading 4 bytes @ address 0x080128A8
Downloading 4 bytes @ address 0x080128AC
Downloading 132 bytes @ address 0x080128B0
Downloading 32 bytes @ address 0x08012934
Downloading 16 bytes @ address 0x08012954
Downloading 140 bytes @ address 0x08012964
Downloading 4608 bytes @ address 0x080129F0
Writing register (PC = 0x 8002e18)
Received monitor command: reset
Resetting target
Read 4 bytes @ address 0x08002E18 (Data = 0xFFFFFFFF)
Read 2 bytes @ address 0x08002E18 (Data = 0xFFFF)
Read 2 bytes @ address 0x08002E1A (Data = 0xFFFF)
Reading 64 bytes @ address 0x08000240
Reading 64 bytes @ address 0x08002940
Reading 64 bytes @ address 0x08001380
Reading 64 bytes @ address 0x080027C0
Reading 64 bytes @ address 0x08002680
Reading 64 bytes @ address 0x080014C0
Reading 64 bytes @ address 0x08002500
Reading 64 bytes @ address 0x08002280
Reading 64 bytes @ address 0x08001F80
Reading 64 bytes @ address 0x08001A00
Reading 64 bytes @ address 0x08001880
Reading 64 bytes @ address 0x08001680
Read 2 bytes @ address 0x0800027A (Data = 0xFFFF)
Read 2 bytes @ address 0x08002962 (Data = 0xFFFF)
Read 2 bytes @ address 0x0800139A (Data = 0xFFFF)
Read 2 bytes @ address 0x080027D6 (Data = 0xFFFF)
Read 2 bytes @ address 0x0800268A (Data = 0xFFFF)
Read 2 bytes @ address 0x080014E2 (Data = 0xFFFF)
Read 2 bytes @ address 0x08002506 (Data = 0xFFFF)
Read 2 bytes @ address 0x0800229A (Data = 0xFFFF)
Read 2 bytes @ address 0x08001F8E (Data = 0xFFFF)
Read 2 bytes @ address 0x08001A2A (Data = 0xFFFF)
Read 2 bytes @ address 0x0800188E (Data = 0xFFFF)
Read 2 bytes @ address 0x0800169E (Data = 0xFFFF)
Setting breakpoint @ address 0x0800027A, Size = 2, BPHandle = 0x0001
Setting breakpoint @ address 0x0800139A, Size = 2, BPHandle = 0x0002
Setting breakpoint @ address 0x080014E2, Size = 2, BPHandle = 0x0003
Setting breakpoint @ address 0x0800169E, Size = 2, BPHandle = 0x0004
Setting breakpoint @ address 0x0800188E, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x0800188E
Setting breakpoint @ address 0x08001A2A, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x08001A2A
Setting breakpoint @ address 0x08001F8E, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x08001F8E
Setting breakpoint @ address 0x0800229A, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x0800229A
Setting breakpoint @ address 0x08002506, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x08002506
Setting breakpoint @ address 0x0800268A, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x0800268A
Setting breakpoint @ address 0x080027D6, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x080027D6
Setting breakpoint @ address 0x08002962, Size = 2, BPHandle = 0x0000
WARNING: No more breakpoint resources left
ERROR: Failed to set breakpoint at 0x08002962
Debugger requested to halt target...