如题。手贱把swd和jtag都禁止后不能烧写程序，用j-flash可以连接开发板，但是读写芯片都不行。板上程序还在正常跑着。请问可能是什么原因呢？该怎么解决？

芯片型号是stm32F103C8，jtag驱动版本是V4.10f，下面是j-flash的一些信息：
Connecting ...  - Connecting via USB to J-Link device 0  - J-Link firmware: V1.20 (J-Link ARM V8 compiled Dec  1 2009 11:42:48)  - JTAG speed: 2000 kHz (Auto)  - Initializing CPU core (Init sequence) ...     - Executing Reset (0, 0 ms)     - Initialized successfully  - JTAG speed: 2000 kHz (Auto)  - Connected successfully Reading entire flash chip ...  - 64 sectors, 1 range, 0x8000000 - 0x800FFFF  - ERROR: RAM check failed @ address 0x20000000.  - ERROR: Write: 0x03020100 07060504  - ERROR: Read: 0xAAAAAAAA AAAAAAAA  - ERROR: (0 bytes of RAM have been checked successfully)  - ERROR: Failed to read back target memory Disconnecting ...  - Disconnected