diff --git a/boards/b-l072z-lrwan1/Makefile.include b/boards/b-l072z-lrwan1/Makefile.include
index e4a0c43e56..4d4531fcd9 100644
--- a/boards/b-l072z-lrwan1/Makefile.include
+++ b/boards/b-l072z-lrwan1/Makefile.include
@@ -11,8 +11,9 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 # this board has an on-board ST-link adapter
 DEBUG_ADAPTER ?= stlink
 
-# call a 'reset halt' command before starting the debugger
-export OPENOCD_DBG_START_CMD = -c 'reset halt'
+# this board can become un-flashable after a hardfault,
+# use connect_assert_srst to always be able to flash or reset the board.
+export OPENOCD_RESET_USE_CONNECT_ASSERT_SRST ?= 1
 
 # this board uses openocd
 include $(RIOTMAKE)/tools/openocd.inc.mk
diff --git a/boards/i-nucleo-lrwan1/Makefile.include b/boards/i-nucleo-lrwan1/Makefile.include
index e2b9138636..02d5c8c0ca 100644
--- a/boards/i-nucleo-lrwan1/Makefile.include
+++ b/boards/i-nucleo-lrwan1/Makefile.include
@@ -11,8 +11,9 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 # to flash this board, use an ST-link adapter
 DEBUG_ADAPTER ?= stlink
 
-# call a 'reset halt' command before starting the debugger
-export OPENOCD_DBG_START_CMD = -c 'reset halt'
+# this board can become un-flashable after a hardfault,
+# use connect_assert_srst to always be able to flash or reset the boards.
+export OPENOCD_RESET_USE_CONNECT_ASSERT_SRST ?= 1
 
 # this board uses openocd
 include $(RIOTMAKE)/tools/openocd.inc.mk
diff --git a/boards/lsn50/Makefile.include b/boards/lsn50/Makefile.include
index 3cb4ee060e..d05c0d3417 100644
--- a/boards/lsn50/Makefile.include
+++ b/boards/lsn50/Makefile.include
@@ -11,8 +11,9 @@ include $(RIOTMAKE)/tools/serial.inc.mk
 # By default, flash this board using an ST-link adapter
 DEBUG_ADAPTER ?= stlink
 
-# call a 'reset halt' command before starting the debugger
-export OPENOCD_DBG_START_CMD = -c 'reset halt'
+# this board can become un-flashable after a hardfault,
+# use connect_assert_srst to always be able to flash or reset the boards.
+export OPENOCD_RESET_USE_CONNECT_ASSERT_SRST ?= 1
 
 # this board uses openocd
 include $(RIOTMAKE)/tools/openocd.inc.mk