update CH582 bootloader instructions

1 files changed, 13 insertions, 2 deletions

diff --git a/CH582.md b/CH582.md
index 2fb36b7..e6143eb 100644
--- a/CH582.md
+++ b/CH582.md
@@ -1,7 +1,7 @@
 # CH582
 
 * Chip is read protected for code sections
-* Bootloader is active
+* Bootloader is active.
 * BLE update seems deactivated
 
 ## Hardware Details
@@ -20,6 +20,17 @@ TBD
 
 TBD
 
+### Bootloader
+
+To enter bootloader, you have to press the bottom button when plugging USB.
+
+The bootloader will remain active for few seconds, waiting for upload.
+
+Important: Because the badge reassigns the bootloader pin as GPIO after boot,
+it is impossible to switch to bootloader as long as the battery is connected
+to the board (the board is always powered and does not reset). To be able to
+access the bootloader you must then desolder the battery.
+
 ## Development Hardware
 
 * [WCH Link Debugger](https://www.aliexpress.us/item/3256803507003815.html)
@@ -32,5 +43,5 @@ TBD
 
 * [CH583 Evaluation Board SDK](https://github.com/openwch/ch583)
 
-* [Open Source Toolchain for CH582/CH583](https://github.com/cjacker/opensource-toolchain-ch32và
+* [Open Source Toolchain for CH582/CH583](https://github.com/cjacker/opensource-toolchain-ch32v)