diff --git a/binary/fullhaaboot-4.2.1.bin b/binary/fullhaaboot-4.2.1.bin
new file mode 100644
index 0000000..4a26043
Binary files /dev/null and b/binary/fullhaaboot-4.2.1.bin differ
diff --git a/mos.yml b/mos.yml
index 913600a..9132dc7 100644
--- a/mos.yml
+++ b/mos.yml
@@ -40,7 +40,7 @@ conds:
   - when: build_vars.TARGETFW == "haa"
     apply:
       config_schema:
-        - ["mg2x.url", "s", "https://raw.githubusercontent.com/yaourdt/mgos-to-tasmota/master/binary/fullhaaboot-3.4.0.bin", {"title": "URL of target firmware"}]
+        - ["mg2x.url", "s", "https://raw.githubusercontent.com/yaourdt/mgos-to-tasmota/master/binary/fullhaaboot-4.2.1.bin", {"title": "URL of target firmware"}]
   - when: build_vars.TARGETFW == "espurna"
     apply:
       config_schema: