MSR2600能否使用V7版本软件？

我的路由器是 MSR2600-10  

[H3C]dis version H3C Comware Platform Software 

Comware Software, Version 5.20, Release 2516P17 

Copyright (c) 2004-2017 New H3C Technologies Co., Ltd. All rights reserved. 

H3C MSR26-00 uptime is 0 week, 0 day, 0 hour, 0 minute 

Last reboot 2013/01/01 00:00:15

 System returned to ROM By Power-up.

 CPU ID: 0x8 512M bytes DDR3 SDRAM Memory 2M bytes Flash Memory PCB Version: 2.0 Logic Version: 1.0 Basic BootROM Version: 5.40 Extended BootROM Version: 5.40 [SLOT 0]AUX (Hardware)2.0, (Driver)1.0, (CPLD)1.0 [SLOT 0]GE0/0 (Hardware)2.0, (Driver)1.0, (CPLD)1.0 [SLOT 0]GE0/1 (Hardware)2.0, (Driver)1.0, (CPLD)1.0 [SLOT 0]8GSW (Hardware)2.0, (Driver)1.0, (CPLD)1.0 [SLOT 0]CELLULAR0/0 (Hardware)2.0, (Driver)1.0, (CPLD)1.0 

请问能否升级到V7版本的软件？ 如能升级。可以是用V7的哪个版本？