diff --git a/addon/www/rest.cgi b/addon/www/rest.cgi
index 79fa490..17084e9 100644
--- a/addon/www/rest.cgi
+++ b/addon/www/rest.cgi
@@ -152,7 +152,7 @@ proc process {} {
 			return [rmupdate::get_addon_info 1 1 1]
 		} elseif {[lindex $path 1] == "start_install_firmware"} {
 			regexp {\"download_url\"\s*:\s*\"([^\"]*)\"} $data match download_url
-			regexp {\"version\"\s*:\s*\"([\d\.\-]*)\"} $data match version
+			regexp {\"version\"\s*:\s*\"([a-f\d\.\-]*)\"} $data match version
 			regexp {\"language\"\s*:\s*\"([^\"]+)\"} $data match lang
 			regexp {\"reboot\"\s*:\s*(true|false)} $data match reboot
 			regexp {\"dryrun\"\s*:\s*(true|false)} $data match dryrun