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diff --git a/coin/pre-provisioning/qtci-macos-12.0-x86_64/README b/coin/pre-provisioning/qtci-macos-12.0-x86_64/README
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--- a/coin/pre-provisioning/qtci-macos-12.0-x86_64/README
+++ b/coin/pre-provisioning/qtci-macos-12.0-x86_64/README
@@ -27,3 +27,12 @@
- Copy its content to Tier1 folder
* Copy Tier1 folder to 101 NFS
- Check folder access rights
+
+# How to upgrade existing Tier1 image
+
+* Open KVM connection to Intel mac Parallels host
+ - Open Parallels :: create new VM :: select macOS :: start installation but then stop it when machine boots to recovery mode
+* You should now have a virtual machine folder in /Users/qt/Parallels/<VM folder>
+* Remove files from <VM folder>/harddisk.hdd/ and copy Tier1 VM files from NFS to <VM folder>/harddisk.hdd/
+* Start the virtual machine and make needed changes
+* Copy <VM folder>/harddisk.hdd to NFS with updated number in its name