diff --git a/FT240X-EEPROM.md b/FT240X-EEPROM.md
index 0a0ac68..038e8a1 100644
--- a/FT240X-EEPROM.md
+++ b/FT240X-EEPROM.md
@@ -44,4 +44,8 @@ CBUS3 Function: TRISTATE
 
 The proprietary libftd2xx calls it an "X-series" device, while libftdi thinks it is an FT230X.
 
-"User data" starts at 0x24 (0x12 in 16-bit word units), which is where the 3-byte "magic unlock code" resides.
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+"User data" starts at 0x24 (0x12 in 16-bit word units), which is where the 3-byte "magic unlock code" resides.
+
+### Upgrading your device
+
+The FTDI config EEPROM values are used to determine which device in the series is being used (more specifically, the USB device description and serial number). It is possible to change this, see [here](https://git.lain.faith/BLAHAJ/sq50-re/wiki/Hardware-info#upgrading-your-device).
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