Rev C Build is not there on your ET1 as per the build number you have mentioned.
The build Number of RevC build is M1-060812 (for released build) and for debug build it will be D1-060812
thanks for your reply!
Is there a table that cross references the various naming and numbering of OS version for the Et1?
Rev C v03.62.1852 build 060812
Rev B vxx.yy.zzzz build 041112
Rev A vxx.yy.zzzz build yyyy
I Don't have such table but we can get all the ET1 Builds (RevA, RevB and RevC) from support Central, and confirm the update package version form Release Note published in support central.