diff --git a/firmware/config/boards/hellen/alphax-2chan/board.mk b/firmware/config/boards/hellen/alphax-2chan/board.mk
index 7efba0d661..05669e1fcb 100644
--- a/firmware/config/boards/hellen/alphax-2chan/board.mk
+++ b/firmware/config/boards/hellen/alphax-2chan/board.mk
@@ -23,3 +23,5 @@ DDEFS += $(PRIMARY_COMMUNICATION_PORT_USART2)
 
 DDEFS += -DSTATIC_BOARD_ID=STATIC_BOARD_ID_ALPHAX_2CHAN
 
+# let 2chan start asap
+DDEFS += -DBOOT_BACKDOOR_ENTRY_TIMEOUT_MS=0
diff --git a/firmware/hw_layer/openblt/blt_conf.h b/firmware/hw_layer/openblt/blt_conf.h
index aab7750f35..5bf488a21d 100644
--- a/firmware/hw_layer/openblt/blt_conf.h
+++ b/firmware/hw_layer/openblt/blt_conf.h
@@ -190,6 +190,7 @@
 #define BOOT_XCP_UPLOAD_ENABLE          (0)
 
 #ifndef BOOT_BACKDOOR_ENTRY_TIMEOUT_MS
+// 500 ms is not enough for USB init but we hope is enough for CAN
 #define BOOT_BACKDOOR_ENTRY_TIMEOUT_MS  (500)
 #endif