Update mtkclient.md

docs/dev/mtkclient.md

@@ -89,6 +89,7 @@ Failed to write backups/lk_a.img to offset 0x1c800000 with length 0x200000.
 
 ## Force BROM
 Unfortunately, it looks like the firmware contains a patched Preloader, and in the event of a crash, the phone just hangs in Preloader without going to BROM.
+Furthermore, BROM mode itself is disabled by efuse, so it cannot be triggered with testpoint, too.
 
 ````shell
 $ mtk crash
@@ -111,4 +112,4 @@ $ mtk printgpt
 MTK Flash/Exploit Client Public V2.0.1 (c) B.Kerler 2018-2024
 
 DaHandler - Please disconnect, start mtkclient and reconnect.
-````
+````