fdisk -l does not show my USB thumbdrive

I installed rescue firmware in dockstar yesterday and since then, fdisk -l does not work any more. After rebooting the dockstar without external drive II can get in via ssh. I attached my thumbdrive (ext2 formatted) to dockstar and dockstar does not report the presence of any USB drive. Any workaround of this issue?

Looks like I screwed up my recue system as well, all becasue of fw_setenv usb_init and fw_setenv arcNumber=2998. Anyway out of this situation? I don't really go to the serial cable route.

When i try to attach a thumdrive to my rescue system it will be recognized but won´t get mounted:
[ 571.147625] usb 1-1.1: new high speed USB device using orion-ehci and address 3
[ 571.263092] usb 1-1.1: New USB device found, idVendor=090c, idProduct=6200
[ 571.270020] usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 571.277397] usb 1-1.1: Product: Generic USB2.0 card
[ 571.282381] usb 1-1.1: Manufacturer: Silicon Motion, Inc.
[ 571.287815] usb 1-1.1: SerialNumber: 12345678901234567890
[ 571.294320] usb 1-1.1: configuration #1 chosen from 1 choice
[ 571.304188] scsi0 : SCSI emulation for USB Mass Storage devices
[ 576.308801] scsi 0:0:0:0: Direct-Access Generic USB SD Reader 1.00 PQ: 0 ANSI: 0 CCS

I want to install a debian on my card reader disk, but get stucked because no sda1 rather sdx is found.
Any hints for me?

regards

After a while following msg. is printed:
[ 962.888089] hub 1-1:1.0: unable to enumerate USB device on port 1
because i can´t reflash from rescue inside i need a workaround or a fix for that...

regards