diff --git a/Compile-keyboard-bootloader.md b/Compile-keyboard-bootloader.md
index b0b1111..7ccae66 100644
--- a/Compile-keyboard-bootloader.md
+++ b/Compile-keyboard-bootloader.md
@@ -9,6 +9,14 @@ make generic-pc13
 
 ```
 this will produce `bootloader_only_binaries/generic_boot20_pc13.bin`  
+## Convert bootloader to hex format
+using `srec_cat`
+windows: http://srecord.sourceforge.net/  
+linux: sudo apt install srecord  
+
+```
+srec_cat bootloader_only_binaries/generic_boot20_pc13.bin -Binary -offset 0x08000000 -output bootloader_only_binaries/generic_boot20_pc13.hex -Intel
+```
 
 ## Next is to use stm32Cube to flash the bootloader
 * Download the stm32cube programmer  
@@ -21,6 +29,7 @@ this will produce `bootloader_only_binaries/generic_boot20_pc13.bin`
 
 ![2022-09-26_13-04](https://user-images.githubusercontent.com/523580/192197890-dcb6d6fc-0ef5-4870-b9d3-ae03fc5f5110.png)
 ![2022-09-26_13-04_1](https://user-images.githubusercontent.com/523580/192197900-c7f8b448-3812-403f-b7b0-728248533790.png)
+![2022-09-26_13-09](https://user-images.githubusercontent.com/523580/192198205-8edecc5f-c30e-4837-8b3c-7f97c97ba40a.png)