diff --git a/addons/point_of_sale/tools/posbox/overwrite_before_init/etc/init_posbox_image.sh b/addons/point_of_sale/tools/posbox/overwrite_before_init/etc/init_posbox_image.sh
index f8c37d118a10c..cb0b5845885f6 100755
--- a/addons/point_of_sale/tools/posbox/overwrite_before_init/etc/init_posbox_image.sh
+++ b/addons/point_of_sale/tools/posbox/overwrite_before_init/etc/init_posbox_image.sh
@@ -20,6 +20,8 @@ echo "export LC_ALL=en_US.UTF-8" >> ~/.bashrc
 locale-gen
 source ~/.bashrc
 
+# upgrade firmware-brcm80211 broke access point on rpi4
+apt-mark hold firmware-brcm80211
 apt-get update && apt-get -y upgrade
 # Do not be too fast to upgrade to more recent firmware and kernel than 4.38
 # Firmware 4.44 seems to prevent the LED mechanism from working