chore(legacy): update Changelogs

legacy/bootloader/CHANGELOG.md

@@ -19,6 +19,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Security
 
+## 1.9.0 [February 2021]
+
+### Added
+- "Stay in bootloader" flag
+
 ## 1.8.0 [February 2019]
 
 ### Changed

legacy/intermediate_fw/ChangeLog

@@ -20,7 +20,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Older changelog:
 
-Version 1.8.0 [Jun 2020]
+Version 1.9.0 [February 2021]
+* Updates bootloader to 1.9.0
+
+Version 1.8.0 [June 2020]
 * Initial version of intermediate firmware
 * Updates bootloader to 1.8.0
 * Deletes storage and the intermediate firmware code