刷机遇到麻烦，不能从ttl传boot2，怎么解决
Initializing filesystem.Datalight Reliance v2.10.1150
Copyright (c) 2003-2006 Datalight, Inc.
Datalight FlashFX Pro v3.00 Build 1358
Nucleus Edition for ARM9
Copyright (c) 1993-2006 Datalight, Inc.
Patents: US#5860082, US#6260156.
Filesystem ready.
Purging temporary files...
Loading Operating System...
Error loading OS image. Removing OS remnants.
Deleting file
Removing directory
Waiting for OS download.
Starting Connectivity services.
Initializing USB subsystem...Done.
Setting Console Log Level = 0
RET - SC: TI_CN_Nspire_SC_Init called
NavNet Ready.
USB Download is enabled.
Press <Enter> to download through the serial port.
总是上面这样的提示，如何是好
通过USB传过去的文件，直到进度条走到头，一直不能开机，等了半个小时也不行，咋办 doc+enter+2 开机，显示错误
Download error: 255BOOT1 Error:
Halting boot due to download error. 竟然神奇般的好了，直接usb同步的1.7的版本
Boot Loader Stage 1 (1.1.8916)
Build: 2007/4/23, 23:37:16
Copyright (c) 2006, 2007 Texas Instruments Incorporated
Using production keys
Last boot progress: 35
Clocks:CPU = 90MHz AHB = 45MHz APB = 22MHz
Available system memory: 37292
Checking for NAND: NAND Flash ID: ST Micro NAND256R3A
SDRAM memory test: Pass
Clearing SDRAM...Done.
Clearing SDRAM...Done.
Clearing SDRAM...Done.
Boot option: Normal
Loading BOOT2 software...
99%
BOOT1: loading complete (380 ticks), launching image.
Boot Loader Stage 2 (1.1.8981)
Build: 2007/4/26, 0:2:32
Copyright (c) 2006, 2007 Texas Instruments Incorporated
Using production keys
Clocks:CPU = 90MHz AHB = 45MHz APB = 22MHz
Checking for NAND: NAND Flash ID: ST Micro NAND256R3A
Initializing graphics subsystem.
Boot option: Normal
Initializing filesystem.
Datalight Reliance v2.10.1150
Copyright (c) 2003-2006 Datalight, Inc.
Datalight FlashFX Pro v3.00 Build 1358
Nucleus Edition for ARM9
Copyright (c) 1993-2006 Datalight, Inc.
Patents: US#5860082, US#6260156.
Filesystem ready.
Purging temporary files...
Loading Operating System...
100%
BOOT2: loading c锴? 经验总结，如果系统版本低于1.6或以下的，不能直接刷3.1，会提示文件损坏，也不能直接刷2.1，虽然能刷成功，但是系统进不去了，必须要刷一下1.7的版本，才行我刷的是1.7.1.50，正常开机了 最后编程器合个影，哈哈！
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