v2 upgrade readme update

README.md

@@ -377,6 +377,7 @@ This script will upgrade wz_mini over the air.  It will backup `wz_mini.conf`, a
 
 If there are any line differences between the old `wz_mini.conf` and the new release, the script will preserve the current config in place.  Note that this means any missing or additional lines.  It is recommended to download the latest wz_mini.conf from github, if there are any major changes to the file, copy the new one to your system first, set your parameteres, save the file, then perform the upgrade.
 
+NOTE: if you are upgrading a V2 camera from a release older than 06-16-22, you must manually download the upgrade-run.sh script from this repo and place it in `wz_mini/bin/upgrade-run.sh`, then run it from there !
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 ## Latest Updates