diff --git a/target/linux/ath79/image/common-mikrotik.mk b/target/linux/ath79/image/common-mikrotik.mk
index 292237c76a..4cf0aa1cac 100644
--- a/target/linux/ath79/image/common-mikrotik.mk
+++ b/target/linux/ath79/image/common-mikrotik.mk
@@ -1,6 +1,6 @@
 define Device/mikrotik
 	DEVICE_VENDOR := MikroTik
-	DEVICE_PACKAGES := rbextract rbcfg
+	DEVICE_PACKAGES := rbcfg
 	LOADER_TYPE := elf
 	KERNEL := kernel-bin | append-dtb | lzma | loader-kernel
 	KERNEL_INITRAMFS := kernel-bin | append-dtb | lzma | loader-kernel
diff --git a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
index 86995de890..884e150bbb 100644
--- a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
+++ b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom
@@ -3,7 +3,9 @@
 [ -e /lib/firmware/$FIRMWARE ] && exit 0
 
 . /lib/functions/caldata.sh
-. /lib/functions/mikrotik-caldata.sh
+
+wlan_data="/sys/firmware/mikrotik/hard_config/wlan_data"
+mac_base="$(cat /sys/firmware/mikrotik/hard_config/mac_base)"
 
 board=$(board_name)
 
@@ -11,8 +13,8 @@ case "$FIRMWARE" in
 "ath9k-eeprom-ahb-18100000.wmac.bin")
 	case $board in
 	mikrotik,routerboard-wap-g-5hact2hnd)
-		mikrotik_caldata_extract "hard_config" 0x1000 0x440
-		ath9k_patch_mac $(macaddr_add $(mtd_get_mac_binary hard_config 0x10) +2)
+		caldata_from_file $wlan_data 0x1000 0x440
+		ath9k_patch_mac $(macaddr_add "$mac_base" +2)
 		;;
 	*)
 		caldata_die "board $board is not supported yet"
diff --git a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/11-ath10k-caldata b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
index 2521f0ad96..b486a5720d 100644
--- a/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
+++ b/target/linux/ath79/mikrotik/base-files/etc/hotplug.d/firmware/11-ath10k-caldata
@@ -3,7 +3,8 @@
 [ -e /lib/firmware/$FIRMWARE ] && exit 0
 
 . /lib/functions/caldata.sh
-. /lib/functions/mikrotik-caldata.sh
+
+wlan_data="/sys/firmware/mikrotik/hard_config/wlan_data"
 
 board=$(board_name)
 
@@ -11,14 +12,14 @@ case "$FIRMWARE" in
 "ath10k/cal-pci-0000:00:00.0.bin")
 	case $board in
 	mikrotik,routerboard-wap-g-5hact2hnd)
-		mikrotik_caldata_extract "hard_config" 0x5000 0x844
+		caldata_from_file $wlan_data 0x5000 0x844
 		;;
 	esac
 	;;
 "ath10k/cal-pci-0000:01:00.0.bin")
 	case $board in
 	mikrotik,routerboard-922uags-5hpacd)
-		mikrotik_caldata_extract "hard_config" 0x5000 0x844
+		caldata_from_file $wlan_data 0x5000 0x844
 		;;
 	esac
 	;;
diff --git a/target/linux/ath79/mikrotik/base-files/lib/functions/mikrotik-caldata.sh b/target/linux/ath79/mikrotik/base-files/lib/functions/mikrotik-caldata.sh
deleted file mode 100644
index 71a1bf02f3..0000000000
--- a/target/linux/ath79/mikrotik/base-files/lib/functions/mikrotik-caldata.sh
+++ /dev/null
@@ -1,26 +0,0 @@
-# Copyright (C) 2019 Robert Marko <robimarko@gmail.com>
-# Copyright (C) 2019 Roger Pueyo Centelles <roger.pueyo@guifi.net>
-#
-# Helper function to extract MAC addresses and calibration data for MikroTik
-#
-
-mikrotik_caldata_extract() {
-	local part=$1
-	local offset=$(($2))
-	local count=$(($3))
-	local mtd
-	local erdfile="/tmp/erd.bin"
-	local fwfile="/lib/firmware/${FIRMWARE}"
-
-	[ -e $fwfile ] && exit 0
-
-	mtd=$(find_mtd_chardev $part)
-	[ -n "$mtd" ] || caldata_die "no mtd device found for partition $part"
-
-	rbextract -e $mtd $erdfile
-
-	dd if=$erdfile of=$fwfile iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
-		caldata_die "failed to extract calibration data from $mtd"
-
-	rm -f $erdfile
-}