diff --git a/src/hw/urukul.md b/src/hw/urukul.md
index 6680a69..c77ed4b 100644
--- a/src/hw/urukul.md
+++ b/src/hw/urukul.md
@@ -57,19 +57,21 @@ Press ENTER when done.
 
 ## Common problems
 
-### Urukul AD9912 product id mismatch
+### Urukul AD9912 product id mismatch or missing LEDs
 
 ```pycon
 ValueError: Urukul AD9912 product id mismatch
 ```
 
 Some Urukuls may fail with this error during testing, usually meaning that the Urukul has not been flashed with the 
-firmware, especially if the ID is `65535` (you will need to edit the code to check this).
+firmware, especially if the ID is `65535` (you will need to edit the code to check this). 
+
+Another common symptom of no firmware is that no LEDs are lit up, besides Power Good - whereas if the firmware has been flashed, the RF channels will be lit red.
 
 You can flash the firmware yourself with a JTAG adapter:
 
 1. Download the latest binary release from [quartiq/urukul](https://github.com/quartiq/urukul) and extract the `urukul.jed` file.
-2. Connect the Urukul with the JTAG adapter to the PC and connect its EEM0 to any available Kasli/Kasli-SoC (do not hot-plug), then turn on the Kasli/Kasli-SoC.
+2. Connect the Urukul with the JTAG adapter to the PC and connect its EEM0 to any available Kasli/Kasli-SoC (**do not hot-plug**), then power on the Kasli/Kasli-SoC.
 3. Run `nix-shell -p xc3sprog`.
 4. Run `xc3sprog -c jtaghs2 urukul.jed -m /opt/Xilinx/Vivado/<available version>/data/xicom/cable_data/digilent/lnx64/xbr/`.
 5. If the last command outputs Verify: Success, then your Urukul is ready. It can also output the message