unrecognized kernel image

I've had an ipaq 5555 running familiar with gpe (unstable) for 6 months. Two
weeks ago I ran a update-upgrade and now the ipaq is nearly unusable. After a
few days I finally connected it to the serial port and I've found out that it
is not booting because of "Unrecognized kernel image". Seems like the
filesystem may be damaged. How do I load a new kernel image at the boot
prompt?

This is what the bootloader says when I try to boot:
boot> boot
booting jffs2...
booting boot/zImage from partition >root<
Scanning all of flash for your JFFS2 convenience. Est Time: 6-12 seconds!
build_list: max = 01FBFFBC
.....
dir entries = 00000DEC
frag entries = 00004EF7
+4 increments = 00000000
+file_offset increments = 0000A53D
find_inode failed for name=zImage-2.4.19-rmk6-pxa1-hh36.9
Failed to resolve inode file structure
loaded file of size = 0x00000000 at location 0xA0008000
kernel partition base A0008000
kernel_magic=20746573
kernel_region_words[9]=3D74696E
Unrecognized kernel image

Thanks a lot

-- 
Pedro