[c-nsp] CRS1 downgrade from 4.0.1 to 3.6.2

[Vikas Sharma]

Hi Mikael,

There is a process to downgrade, but it is not working for me

http://www.cisco.com/web/Cisco_IOS_XR_Software/pdf/CRS-1_Upgrade_Procedure_3_6_x_4_0_0_to_401-3.pdf

I have 3.6.2 in production network and I want to move to 4.0.1 due to some
really "GOOD" feature availability. I also think the last option is
turboboot, if I do not find any other way to downgrade.

Regards,
Vikas

On Fri, Feb 25, 2011 at 5:35 PM, Mikael Abrahamsson <swmike at swm.pp.se>wrote:

> On Fri, 25 Feb 2011, Vikas Sharma wrote:
>
> Hi,
>>
>> I have upgraded CRS1 to 4.0.1 from 3.6.2. Upgrade worked fine and it is
>> running 4.0.1. But the issue is I am not able to downgrade it back to
>> 3.6.2
>>
>
> I believe the release notes say that when you've finished upgrading to
> 4.0.x and removed the upgrade package, you cannot downgrade again.
>
> If you want to go back to 3.6.2 you have to Turboboot that image including
> recommended reformat of the flash drives to FAT16.
>
> Perhaps when you do this, you might as well go to 3.8.x instead of the now
> (afaik) unsupported 3.6.2?
>
> --
> Mikael Abrahamsson    email: swmike at swm.pp.se
>