# EM7455 does not reach BOOT and HOLD mode **URL:** \ **Category:** MC/EM Series\ **Created:** [December 16, 2023, 9:22am UTC](https://forum.sierrawireless.com/t/em7455-does-not-reach-boot-and-hold-mode/31274 "2023-12-16T09:22:42Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![wilkens](https://avatars.discourse-cdn.com/v4/letter/w/5e9695/32.png) [@wilkens](https://forum.sierrawireless.com/u/wilkens)\ **Post date:** [December 16, 2023, 9:22am UTC](https://forum.sierrawireless.com/t/em7455-does-not-reach-boot-and-hold-mode/31274/1 "2023-12-16T09:22:42Z")
I want to upgrade the old firmware. Have 3 EM7455 here: 2 of them from Fujitsu Lifebook, one from unknown source. Under Linux Ubuntu compiled successfully fwdwl-litehostx86\_64 did most steps from lite-fw-download-readme.txt ModemManager deactivated, blacklist Gobi drivers (no effect recognized), sometimes cdc\_mbim module / driver loaded (no effect recognized), started from “cold”, deactivated network etc. tried about 50 times in the last ten hours invoked (in proper dir) sudo bin/fwdwl-litehostx86\_64 --fw path ~/Downloads/SierraWireless7455\_JulianE559/FWfolder/ result “other modem”: “Firmware download process completed successfully.” Works fine. Does not help: Modem does not function in this Laptop anyway (BIOS whitelist??). Means: Setup is fine, can work, did work with one of three EM7455 modems. Problem: both EM7455 from Fujitsu (one was updated successful some years ago) show: Waiting for modem to come up in BOOT and HOLD mode … Modem not coming up in BOOT and HOLD mode in 60 seconds. Please check parameters. Application terminates. So both do not enter the BOOT and HOLD mode. Question: How can “not enter the BOOT and HOLD mode.” be resolved? * * * log says: (please pardon line numbers and privacy edit) 211 Application version: 1.0.2307.1 212 INFO: QDL Port: 213 INFO: Device Path: /dev/cdc-wdm0 214 INFO: FW Path: /home/###/Downloads/SierraWireless7455\_###/FWfolder/ 215 Target image Info: 216 Carrier :GENERIC 217 FW Version :02.38.00.00 218 Model ID :SWI9X30C 219 Package ID :000 220 PRI Version:002.082 221 SKU :9999999 222 Switching device into download mode … 223 Modem Needs FW 224 Modem Needs PRI 225 Waiting for modem to disconnect from the host … 226 Modem disconnected from host. 227 Waiting for modem to come up in BOOT and HOLD mode … 228 Modem not coming up in BOOT and HOLD mode in 60 seconds. Please check parameters. Application terminates. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [December 16, 2023, 11:01am UTC](https://forum.sierrawireless.com/t/em7455-does-not-reach-boot-and-hold-mode/31274/2 "2023-12-16T11:01:19Z")
Does it work in windows exe upgrade? ---
**Author:** ![wilkens](https://avatars.discourse-cdn.com/v4/letter/w/5e9695/32.png) [@wilkens](https://forum.sierrawireless.com/u/wilkens)\ **Post date:** [December 16, 2023, 11:57am UTC](https://forum.sierrawireless.com/t/em7455-does-not-reach-boot-and-hold-mode/31274/3 "2023-12-16T11:57:33Z")
no, it does not. I tried the 072/02.33 and the 082/02.38 versions as exe file, root. Starts properly, fails. Quite sparse message, try to take a note and report here if I manage to do so. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\ **Post date:** [December 16, 2023, 2:40pm UTC](https://forum.sierrawireless.com/t/em7455-does-not-reach-boot-and-hold-mode/31274/4 "2023-12-16T14:40:55Z")
If you type at!boothold, does DM port come out?