Hello ...

I found this DSL router on my bag, and I try to modify it..
The N10 N12 and N14 _C1 have same board, same or similar fw / user interface.
GPL source is avalible .. so "we are free" ...

SOC is Ralink RT63365E
RAM is 32M
Flash 8M
Wifi 150Mbps  (rt5390ap ?? )
No USB !!!

So, I need usb port, for printer, usb stick, etc.

HW mod:
we need solder one cap, fuse or short wire, to give +5V on usb socket pin
now need to solder usb socket or wire for usb hub (my choice / mod)
(buy any cheap 4 port usb hub with external power source socket)
Pics:

SW mod:

Cause, router have 8MB flash only, we need "extra storage" for file system.
If we can boot form USB Stick (usb-mass-storage), we need to recompile kernel
with all required modules. (ehci-hcd, usbcore, scsi, etc.)

All needed modified config files for kernel, profile for GPL are there.
It is for GPL 1.1.0.4 source from Asus website.

Make these partiton on your new USB stick:
sda1 - 64MB ext3  label rootfs
sda2 - 64MB swap
sda3 - all available space ext3 or fat32 label data

Make "your own" firmware with modified .conf files from GPL source
after compile, copy all files from GPL tmpfilesys/filesystem to usb (sda1)
flash "new" firmware from Project/images DSL-N10-C1_USBMOD_1.1.0.4.trx into the router
..and now your router can run from usb key ..

Enjoy.

I'm trying to compile but stuck at this boa-asp error.

cc -g -O2 -Wall -I. -I../ -I../../../libdisk/ -DTRENDCHIP  -c grammar.c 
In file included from grammar.y:11:0:
mini-asp.h:107:5: error: conflicting types for ‘gb_parse’
 int gb_parse (void*);
     ^
In file included from mini-asp.h:105:0,
                 from grammar.y:11:
grammar.tab.h:78:5: note: previous declaration of ‘gb_parse’ was here
grammar.tab.c: In function ‘gb_parse’:
grammar.tab.c:1195:7: error: too few arguments to function ‘gb_lex’
In file included from grammar.y:11:0:
mini-asp.h:109:5: note: declared here
 int gb_lex (YYSTYPE* yylval, asp_reent* reent);
     ^
grammar.y:15:35: error: ‘__yy_reent’ undeclared (first use in this function)
     #define yy_reent ((asp_reent*)__yy_reent)
                                   ^
grammar.y:47:39: note: in expansion of macro ‘yy_reent’
 aspfile:statements {$$=$1;yy_reent->root = $$;};
                                       ^
grammar.y:15:35: note: each undeclared identifier is reported only once for each function it appears in
     #define yy_reent ((asp_reent*)__yy_reent)
                                   ^
grammar.y:47:39: note: in expansion of macro ‘yy_reent’
 aspfile:statements {$$=$1;yy_reent->root = $$;};
                                       ^
make: *** [grammar.o] Error 1

If I modify Makefile, removing boa-asp definition, the build was completed successfully.

How did you overcome this boa-asp issue? I tried to do binwalk to fetch the original boa-asp binary, but haven't been successful in extracting the squashfs.

@krembuk: I also got this error in Ubuntu 16.04 64bit, but got it fixed by compiling on Ubuntu12.04 32bit. This might be some error related to 32/64bit architecture.