3600V2 升级失败

H3C S3600V2-28TP-S     Version 5.20, Release 2108P01    升级版本为s3600v2_e-cmw520-r2112p04   报错

<H3C>bootrom update file s3600v2_e-cmw520-r2112p04.bin slot 1 

 This command will update bootrom file on the specified board(s), Continue? [Y/N]:y 

 Now updating bootrom, please wait... 

 Failed to update bootrom of Board 1.

<H3C>dir

 Directory of flash:/ 0 -rw- 25759340 Jan 04 2010 06:22:09 s3600v2_e-cmw520-r2112p04.bin 1 

 -rw- 8504 Jan 04 2010 06:50:37 config.cwmp 2 

 -rw- 287 Jan 04 2010 06:50:37 system.xml 3 

 -rw- 2768 Jan 04 2010 06:50:39 2019.9.26.cfg 4 

 -rw- 325760 Jan 01 2010 00:05:31 logfile.log 5 

 -rw- 2422 Jan 02 2010 00:56:41 https-server.p12 6 

 -rw- 2517 Jan 01 2010 00:46:26 20180408.cfg 7

 -rw- 2517 Jan 01 2010 00:49:46 20180416.cfg 8

 -rw- 24876032 Aug 08 2008 20:00:00 s3600v2_e-cmw520-r2108p01.bin 9

drw- - Jan 01 2010 00:00:25 seclog 126592 KB total (75490 KB free) 

 <H3C>