Upgrade SD 4250 from C6.0 to S-C6.2

Hello,

 

I read several documents, release notes, and topic as the one below

http://community.acmepacket.com/t5/Operations-and-Management/What-is-the-best-software-version-to-go-to-6-1-6-2-6-3/m-p/636/highlight/true#M100

 

I also read this document:

Net-Net_4000_S-C6.2.0_ACLI_Maintenance_and_Troubleshooting.pdf  (Document Number: 400-0063-62 Rev. 1.10)

 

I did not find the answer regarding those 2 questions:

- Is it possible to upgrade directly from C6.0 to S-C6.2, or upgrade path C6.0 to S-C6.1 then to S-C6.2 have to be followed.

- same question for rollback process, in reverse

 

Thank you for your answer