Check Point: Upgrade Gaia/Check Point From R77.10 To R77.20 In CLI

I have had a few customers that have been running R77.10 on top of Gaia.  Several have wanted to upgrade to R77.20.  This has been an a proven upgrade process.  Keep in mind, in some of these upgrades, they had the R77.10 jumbo hotfix applies.  I have had to take that off first, then do the upgrade to R77.20.  Then, do the R77.20 jumbo hotfix.
Most of my clients have a distributed environment.  Do the management station first.  Then the enforcement modules.

Management Station
migrate export with both version r77.10 and r77.20 (use both versions of the "upgrade_tools")
TFTP the image off the box.
gtar -zxvf R77.20 file
install r77.20 via cli (./UnixInstallScript)
failed install due to r77.10 jumbo hotfix
gtar -zxvf R77.10 jumbo hotfix file
uninstall r77.10 jumbo hotfix (./UnixInstallScript -u)
install r77.20 (./UnixInstallScript)
gtar -zxvf R77.20 jumbo hotfix file
install r77.20 jumbo hotfix (./UnixInstallScript)

enforcement module #2 (standby unit)
failed install due to r77.10 jumbo hotfix
uninstall r77.10 jumbo hotfix
install r77.20
install r77.20 jumbo hotfix

Go into management station and change version.
Check SIC for CP EM #2.
Make secondary CP Enforcement Module the primary in takeover position.
Failover primary enforcement module to be standby unit.

enforcement module #1 (active unit)
stop services (cpstop)
uninstall r77.10 jumbo hotfix
stop services (cpstop)
install r77.20
install r77.20 jumbo hotfix

Push policy.