read before the update.

firmware/Please read me before update !!!.txt

@@ -0,0 +1,6 @@
+For version earlier than V3.0.33 can only be updated to V3.0.33, if you update it to V3.1.X, there will be 404 error if you visit the web console.
+Still you can update it back, via http://ip_of_your_clock/update.
+
+V3.0.X has different software structure with the V3.1.X, they should not be updated to each other.
+
+Thank you.

firmware/V3.1.0/update history.txt

@@ -1,4 +0,0 @@
-V3.1.0 20230827
-The new and stable version, with 13 languages on the web.
-
-Due to software structure reason, old firmware earlier than this version is not supported update to this version.

firmware/V3.1.1/update history.txt

@@ -1,7 +0,0 @@
-V3.1.1 20230827
-1) Small fix, when play the "fack" gif file, which contains no gif content, will cause system reboot.
-
-V3.1.0 20230827
-The new and stable version, with 13 languages on the web.
-
-Due to software structure reason, old firmware earlier than this version is not supported update to this version.

firmware/V3.1.3/update history.txt

@@ -1,10 +0,0 @@
-V3.1.3 20231206
-1) Fix connect to open WiFi.
-
-V3.1.1 20230827
-1) Small fix, when play the "fack" gif file, which contains no gif content, will cause system reboot.
-
-V3.1.0 20230827
-The new and stable version, with 13 languages on the web.
-
-Due to software structure reason, old firmware earlier than this version is not supported update to this version.