Second device dosn't see any usb devices and when we test a voltage using electric meter on usb port there is nothing from start SRX to shutdown. This device is dead and there is nothing that we can do. USB not boot and TFTP try to download soft but like I write there is error during downloading (more precisely - during writing) proces. On EX series is posibility to format hdd before start to copy and install, on SRX there is no options for that. We loose this device.
First device start with u-boot properly. SRX sees usb device but not boot unfortunately. We test many usb from many brands and different size. Without success. There is not even a word during the u-boot about "failed boot from usb" or "problem with booting from usb" or event about 'trying to boot from usb", so I don't know if SRX try to boot from this device or not.
Maybe someone could confirm me though that my environment variables are ok?
I'm afraid that it might be all ok but either of the u-boot variables blocks to boot SRX from USB or something similar.