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Catalyst 2960L-SM-48PS : Upgrade Release 15.2.7E2 fails

I try to upgrade IOS & Web_UI from release 15.2.6 to Release 15.2.7E2 using Web UI, with tar file from this page 

sha512sum is verified, but

  1. first upgrade failed :
    • File uploaded in uploadFile directory and md5sum (fd8643a418ffce103d371ff96931eb25) is verified.
    • WEB UI isn't present ("html" directory is moved in "html.old" and new "html" dir is empty in current IOS dir (c2960l-universalk9-mz.152-6.E2b))
    • old CISCO web ui is available html directory
  2. Second upgrade failed too :
    replacing 'html' dir in current IOS allows to get WEB_UI enabled, but new upgrade fails in other way.
    • Uploaded file is untar in new 'html' dir in current IOS dir (c2960l-universalk9-mz.152-6.E2b),
    • Nothing else

Web UI is disabled, and upgrade not applied. Second upgrade was different, perhaps first try changed some parameters ?

 

I should apply this upgrade without finish to broke IOS system. 

Is there a way apply it ?

For example :

  • Upgrade WEB UI first ?
  • Reset some parameter (old WEB UI or CLI) to allow upgrade ?
  • Finish it manually using old WEB UI or CLI (moving files and change boot path) ?

Chears,

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