h3c 7503升级iso

[H3C]dis version 

 H3C Comware Platform Software

 Comware software, Version 3.10, Release 3135

 Copyright (c) 2004-2007 Hangzhou H3C Technologies Co., Ltd. All rights reserved. 

H3C S7503 uptime is 0 week, 0 day, 19 hours, 30 minutes 

 SRPG 0: uptime is 0 weeks,0 days,19 hours,30 minutes 

H3C S7500 with 1 MPC8245 Processor 

256M bytes SDRAM 

32768K bytes Flash Memory 

512K bytes NVRAM Memory 

PCB Version : VER.D 

BootROM Version : 531 

CPLD Version : 005

 Second CPLD Ver : 005 

Software Version : S7503-3135 

Patch Version : None 

 LPU 1: uptime is 0 weeks,0 days,19 hours,28 minutes 

H3C S7500 LPU with 1 MPC8241 Processor 

128M bytes SDRAM 

0K bytes Flash Memory 

0K bytes NVRAM Memory 

 PCB Version : VER.C 

BootROM Version : 531 

CPLD Version : 005 

Software Version : S7503-3135 

Patch Version : None 

这个版本太旧，想升级下版本，官网看到下，不知道下哪个合适，有谁能指点下。