J-LINK V8，V9下载STM32F103R8T6，V9可以下载，V8可以找到单片机，下载不了。
***JLink Error: Could not start CPU core. (ErrorCode: -1)
Erase Failed!
Error: Flash Download failed  -  "Cortex-M3"
Flash Load finished at 12:03:36
Load "F:\stm32F103R8T6_DTU_HTTP\stm32F103R8T6_DTU_HTTP\MDK-ARM\stm32F103R8T6_DTU\stm32F103R8T6_DTU.axf"
Set JLink Project File to "F:stm32F103R8T6_DTU_HTTPstm32F103R8T6_DTU_HTTPMDK-ARMJLinkSettings.ini"
* JLink Info: Device "STM32F103R8" selected (64 KB flash, 20 KB RAM).

JLink info:
------------
DLL: V4.90 , compiled Jul 28 2014 10:35:20
Firmware: J-Link V9 compiled Mar  2 2018 17:07:57
Hardware: V9.40
S/N : 59425868
Feature(s) : RDI, GDB, FlashDL, FlashBP, JFlash, RDDI

* JLink Info: Found SWD-DP with ID 0x1BA01477
* JLink Info: Found SWD-DP with ID 0x1BA01477
* JLink Info: Found Cortex-M3 r1p1, Little endian.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
* JLink Info: TPIU fitted.
ROMTableAddr = 0xE00FF003

Target info:
------------
Device: STM32F103R8
VTarget = 3.274V
State of Pins:
TCK: 0, TDI: 0, TDO: 0, TMS: 1, TRES: 1, TRST: 0
Hardware-Breakpoints: 6
Software-Breakpoints: 8192
Watchpoints:          4
JTAG speed: 200 kHz

Erase Failed!
Error: Flash Download failed  -  "Cortex-M3"
Flash Load finished at 12:03:40
Load "F:\stm32F103R8T6_DTU_HTTP\stm32F103R8T6_DTU_HTTP\MDK-ARM\stm32F103R8T6_DTU\stm32F103R8T6_DTU.axf"
Set JLink Project File to "F:stm32F103R8T6_DTU_HTTPstm32F103R8T6_DTU_HTTPMDK-ARMJLinkSettings.ini"
* JLink Info: Device "STM32F103R8" selected (64 KB flash, 20 KB RAM).

JLink info:
------------
DLL: V4.90 , compiled Jul 28 2014 10:35:20
Firmware: J-Link V9 compiled Mar  2 2018 17:07:57
Hardware: V9.40
S/N : 59425868
Feature(s) : RDI, GDB, FlashDL, FlashBP, JFlash, RDDI

* JLink Info: Found SWD-DP with ID 0x1BA01477
* JLink Info: Found SWD-DP with ID 0x1BA01477
* JLink Info: Found Cortex-M3 r1p1, Little endian.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
* JLink Info: TPIU fitted.
ROMTableAddr = 0xE00FF003
Error: Flash Download failed  -  Target DLL has been cancelled
Flash Load finished at 12:04:26
Load "F:\stm32F103R8T6_DTU_HTTP\stm32F103R8T6_DTU_HTTP\MDK-ARM\stm32F103R8T6_DTU\stm32F103R8T6_DTU.axf"
Set JLink Project File to "F:stm32F103R8T6_DTU_HTTPstm32F103R8T6_DTU_HTTPMDK-ARMJLinkSettings.ini"
* JLink Info: Device "STM32F103R8" selected (64 KB flash, 20 KB RAM).

JLink info:
------------
DLL: V4.90 , compiled Jul 28 2014 10:35:20
Firmware: J-Link V9 compiled Mar  2 2018 17:07:57
Hardware: V9.40
S/N : 59425868