diff --git a/UV-Studio.md b/UV-Studio.md
index e655a49..db07d7d 100644
--- a/UV-Studio.md
+++ b/UV-Studio.md
@@ -50,6 +50,9 @@ The required radio mode depends on the operation:
 * `Live Viewer`, live `RF Log`, calibration backup/restore, RF-log export, and logo upload/download: start the radio normally
 * firmware flashing: start the radio in `DFU` / flash mode
 
+> [!NOTE]
+> To enter `DFU` / flash mode on a UV-K1 or UV-K5 V3, switch the radio off, hold `PTT`, and switch it on while continuing to hold `PTT`. Then release `PTT` and connect or reconnect the USB data cable. No side key is required.
+
 If UV Studio cannot communicate with the radio, disconnect the cable, restart the radio in the required mode, reconnect the cable, and select the serial port again.
 
 ## Live Viewer
diff --git a/UVTools2-web-tool.md b/UVTools2-web-tool.md
index bfa9521..b3b30b9 100644
--- a/UVTools2-web-tool.md
+++ b/UVTools2-web-tool.md
@@ -32,6 +32,9 @@ The required radio mode depends on the operation:
 * firmware flashing: start the radio in `DFU` / flash mode
 * calibration dump, calibration restore, logo upload, and logo download: start the radio normally
 
+> [!NOTE]
+> To enter `DFU` / flash mode on a UV-K1 or UV-K5 V3, switch the radio off, hold `PTT`, and switch it on while continuing to hold `PTT`. Then release `PTT` and connect or reconnect the USB data cable. No side key is required.
+
 If UVTools2 cannot communicate with the radio, disconnect the cable, restart the radio in the expected mode, reconnect the cable, and select the serial port again.
 
 ## Flash firmware