When having deleted HG pure EM-root suitably, it fitted in a total of 3M or less somehow.

 Since a DISKFULL lamp lights up for 10 seconds during starting in order to drop on EM mode, please push a power supply SW shorter once then. 

 ip  : 192.168.11.150 mask: 255.255.255.0 gw:192.168.11.1
 id:root              pw:kuroadmin

 Since ftp is put in, cut return is possible by taking firmimg.bin by FTP and writing in mtdblock0.

ftp ...
cd /mnt/boot
get firmimg.bin /dev/mtdflash0







HG純正EM-rootを適当に削除していたら、なんとか合計3M以下に収まりました

EMモードに落とすためには、起動中にDISKFULLランプが10秒点灯しますので、そのときに電源SWを1回短めに押してください。

ip  : 192.168.11.150
mask: 255.255.255.0
gw  : 192.168.11.1

id:root
pw:kuroadmin

ftpが入れてありますので、切り戻しはFTPでfirmimg.binを取ってきて、mtdblock0に書き込むことで可能です。

ftp ...
cd /mnt/boot
get firmimg.bin /dev/mtdflash0