diff --git a/user/u-boot-rm/APKBUILD b/user/u-boot-rm/APKBUILD
index 25b14ad..3e5eb8f 100644
--- a/user/u-boot-rm/APKBUILD
+++ b/user/u-boot-rm/APKBUILD
@@ -5,7 +5,7 @@ pkgname=u-boot-rm
 pkgver=2020.09
 _rm1tag=97b35fdddf0077abd2e0f0409b94ef20adbe8565
 _rm2tag=47c91918aa7724c16b6eaf87cf5dfbf4548eafc1
-pkgrel=1
+pkgrel=2
 
 pkgdesc="u-boot bootloader common files"
 url="https://www.denx.de/wiki/U-Boot/"
@@ -136,7 +136,7 @@ done
 sha512sums="
 7cc8d513cac1d63ee5119529caa056164ee3bc3633da5d880fbfb344b770c7c53c41475d42dd129b505390dcd5449e14524afc06f7cdba9354af7e70a7035ef9  u-boot-rm1-97b35fdddf0077abd2e0f0409b94ef20adbe8565.tar.gz
 d0d18b123c4281285a8b3c1afd9ef623b48a33506399c8e0dbc393f22d967ee3e5df7030aab26c4fe8cad614f3f22f1ea5d6b5bb4ef5cc46fffe56b7ac7c3c28  u-boot-rm2-47c91918aa7724c16b6eaf87cf5dfbf4548eafc1.tar.gz
-49a7325bf0df5661c33b043d314eea382c348d2862b807991e151d9ef34ecd01d5c4b3c602c171e66c63c881631ccd610f81bc696b00025d4ae0926b82896731  update-u-boot
+6bf8c6dec3764aead977e82114984ac28e84a4b83ae77a74edf6242673da5ddf7b73c11386d5c077d9e6738248ccda44c57b628af13d1597dd619f764e063731  update-u-boot
 f8c9bb6e84d6f0620c976ac7ad5dd7ec7ff9dfdd4b1d03d2bf6653e7beccf80bdf2debfc92fb1f696dba92fb40287d3c45897e0078951451d0835cb61a5f16d1  README.txt
 673cb917cc565ae245d4a7d659227bc240473112bc9c73ae184a64ce74be7994273d6dc4db17194d348941f83a42b3b67d3140f6f23c37c13d6dc93f7d76cc39  rm1-uboot-config-patch.diff
 0e98404ca6d20eb01bd9c129b05e2eb10c60a692a56adc221ea283b4bfe7b0bcc2851121d4c3fe51e07a9784c339f7ccb221e0cc3f3603144fec46be66d0cbcc  rm2-uboot-config-patch.diff
diff --git a/user/u-boot-rm/update-u-boot b/user/u-boot-rm/update-u-boot
index fd50993..fae99d7 100755
--- a/user/u-boot-rm/update-u-boot
+++ b/user/u-boot-rm/update-u-boot
@@ -16,6 +16,7 @@ get_defaults() {
 	if [ -z "$device" ]; then
 		case "$board" in
 		wand|cubie|cubie2) device=/dev/mmcblk0p0 ;;
+		zero-gravitas) device=/dev/mmcblk1
 		esac
 	fi
 
@@ -60,8 +61,8 @@ while [ $# -gt 0 ]; do
 		case "$1" in
 		wand|wandboard) board="wand" ;;
 		cubie|cubieboard) board="cubie" ;;
-		rm1) board="zero-gravitas" ;;
-		rm2) board="zero-sugar" ;;
+		zerogravitas) board="zero-gravitas" ;;
+		zerosugar) board="zero-sugar" ;;
 		*) usage; exit 1;;
 		esac
 		shift
@@ -112,10 +113,11 @@ cubie|cubie2)
 	;;
 zero-gravitas)
 	[ -e "$imagedir/zero-gravitas" ] || die "rM1 images not installed, apk add u-boot-rm1"
-	$drurun dd if=/dev/zero of=/dev/mmcblk1 bs=512 seek=1536 count=16
-	$dryrun echo 0 > /sys/block/mmcblk1boot0/force_ro
-	$dryrun dd if=$imagedir/zero-gravitas/u-boot.bin of=/dev/mmcblk1boot0 bs=512 seek=2
-	$dryrun echo 1 > /sys/block/mmcblk1boot0/force_ro
+	$dryrun dd if=/dev/zero of=$device bs=512 seek=1536 count=16
+	[ -z "$dryrun" ] && echo 0 > /sys/block/${device/\/dev\/}boot0/force_ro
+	$dryrun dd if=/dev/zero of=${device}boot0 bs=512 count=2
+	$dryrun dd if=$imagedir/zero-gravitas/u-boot.bin of=${device}boot0 bs=512 seek=2
+	[ -z "$dryrun" ] && echo 1 > /sys/block/${device/\/dev\/}boot0/force_ro
 	;;
 zero-sugar)
 	die "rM2 not yet tested"