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-rw-r--r--docs/which-hex-file.md11
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diff --git a/docs/which-hex-file.md b/docs/which-hex-file.md
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@@ -1,7 +1,10 @@
# How to figure out which .hex file to use
-The name of a product is **not** enough information to find the right .hex
-file. Ask the light what firmware it needs!
+Using the wrong firmware will make the light stop working, so when flashing
+firmware, **be sure the model number matches**!
+
+The name of a product is *not* enough information to find the right .hex
+file. Ask the light what firmware it needs:
1. Use the Version Check function (15 or more clicks from Off) to find out
which flavor of the firmware the light has installed.
@@ -16,6 +19,6 @@ file. Ask the light what firmware it needs!
The Version Check format has changed a few times. Use
[this section of the manual](anduril-manual.md#Version_Check_Formats)
to learn about those formats and how to use them. In most cases, it should
-have a model number and a date... and you need the model number to find the
-correct .hex file.
+have a model number and a date... and **you need the model number** to find
+the correct .hex file.