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Thanks for you answer.
Yes, the problem is in device. Some peaple report the same bug in lpc2103. Look: http://tech.groups.yahoo.com/group/lpc21isp/message/174
I have device with booter version 3.1
What version of booter do you use? May be you device has another booter version?

Ok, I send another file to you. There are no glitches on RX (I use oscilloscope).
The booter started. I use BusHound utility and saw "?" -> "Synchronized"

But i think the booter v3.1 have a bug:
Booter receive first '\n' or '\r' and ignore the next one! No echo to ignored symbol.
For example:
if you send "J\r\n" the echo is "J\r"
if you send "J\n\r" the echo is "J\n"
if you send "Synchronized\r\n" the echo and answer is  "Synchronized\rOK\r\n"
I waste some time and patch the lpc21isp. I change "\n\r" in all commands to "\n" and some other changes in sector size table...
And it work!!! Now I can write the flash. But lpc21isp not so comfortable as FM...

Now I understand what happened...
Booter v3.1 don't echo the '\n'.
If you send "J\r\n" the answer is:
"J\r0\r\n100924197\r\n" instead
"J\r\n0\r\n100924197\r\n".
All ather command is the same - no symbol '\n' in the echo...
I try 3 utilites for isp ("FM","LPC2000 flash utility","lpc21isp") and all of them send and wait '\n'.
Now i try to patch the open source lpc21isp...

I have Keil's board MCB2300 with lpc2368FBD100. And i can't load it by flashmagic. All harware is ok, bootloader starts and i can drive bootloader using FlahsMagicTerminal. The bootloader version 3.1 (command 'K'). The
devece ID is '100924197' (command 'J').
I wrote some communication log between FlahsMagic and lpc2368 while operation "Reading device signature..." :
FM send 'J'
lcp send 'J0 100924197'
FM send 'J' again ....

May be FM don't anderstand so long ID?

sorry about my english...