diff --git a/Update-firmware.md b/Update-firmware.md
index 8c9464a..53089f5 100644
--- a/Update-firmware.md
+++ b/Update-firmware.md
@@ -12,12 +12,15 @@ The basic updating procedure can be simply done by following two steps:
 
 
 # Side notes
-If you are UNDER v2.0.0 or nightly n_240114, you can only update with hackrf mode with normal procedure (instead of update with hackrf serial)   
+- If you are UNDER v2.0.0 or nightly n_240114, you can only update with hackrf mode with normal procedure (instead of update with hackrf serial)   
 Above v2.0.0 or nightly n_240114, you are free to update whatever you want, however, online serial update is still recommend.
 
 
-In theory, it is impossible to brick the device, since you can always try the DFU recovery procedure. However, the updating might become fiddly in certain conditions.
+- In theory, it is impossible to brick the device, since you can always try the DFU recovery procedure. However, the updating might become fiddly in certain conditions.
 
+- You can cross versions upgrade (e.g. 1.2 -> 2.0), also you can downgrade whatever you want(e.g 2.0 -> 1.9). But note that if sdcard content version not match, things may not work properly. Please make sure sdcard content versions match.
+
+- Updating steps order doesn't matter, as long as you finish all of them at the end.
 # Detail guide
 
 >If you prefer watching a video guide, you should watch this one: