Onhub TP-LINK TGR1900 future support?

For Developers
99

Could somebody help with TP-Link Onhub (TGR1900)?

When I try to:

ssh root@192.168.1.1 -C "dd if=/dev/zero bs=512 seek=7552991 of=/dev/mmcblk0 count=33 && \
dd if=/root/openwrt-ipq806x-chromium-tplink_onhub-squashfs-factory.bin of=/dev/mmcblk0"

I always get:

33+0 records in
33+0 records out
dd: error writing '/dev/mmcblk0': No space left on device
1025+0 records in
1024+0 records out

Please help