is it possible to install XPe at a C90LE7 4G/2G for troubleshooting and later on to switch back?
Is WDM 4.7.2 able to handle C90 to do this? Or did I need 4.8 or is there a hotfix?
Although technically possible, you would have a problem with the later upgrade to WES7. Downgrading will work fine but no upgrade due to licensing issues.