Just to clarify: My exact mode of Huawei 4G router is CPE B593u-12. So my previous writings about and are specific to that exact model. According to website following models exist: • B593u-12: FDD 800/900/1800/2100/2600MHz • B593s-22: TDD 2600 FDD 800/900/1800/2100/2600MHz (Speed to 150Mbps) • B593s-82: TDD 2300/2600MHz • B593s-58: TDD 1900/2300/2600MHz • B593s-58b: TDD 1900/2300MHz • B593u-91: TDD 2300/2600MHz • B593u: LTE FDD 850/900/1800/1900/2600 MHz • B593s: Band 42 (3400-3600MHz) • B593u-513 • B593s-42 • B593u-501 • B593u-41 • B593s-601 In Finland the most common models are the two first ones: u-12 and s-22. There are number of (they even copy/paste stuff from my blog without crediting me as the author), but please carefully find out the exact model before upgrading. If you manage to inject an incorrect firmware, it will most likely brick your thing. I didn't try that and don't plan to.

What's funny is that Huawei does not publicly have a B593 in their product portfolio, apparently their only sales/support channel is via their client Telcos and they don't publish anything except the required by GPL v2 license. TFTP can be used by this tool: Here is a summary how TFTP/BOOTP works at Speedtouch/Thomson/Technicolor routers: But this methodology also works with other routers.

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The challenge is to know how to set the B593 in BOOTP-mode. To set a router in BOOTP-mode is usually done by pressing some buttons on the router in a special sequence. Assumed that a router supports that mode. BOOTP was developed before DHCP.

Usually when a device supports DHCP it also supports BOOTP. The other way is know the root access of CLI shell to deactivate firewall. I post this info also on unlockmodemfree.biz customized firmware is blocking factory firmware. On my modem with V200R001B180D20SP05C69 i was able to upgrade firmware, but with simple trick. I changed with hex editor in factory bin file 9 positions: V200R001B236D30SP00C00 on V200R001B180D20SP05C69. After that upgrade is possible.

With V200R001B180D20SP05C260 maybe this V200R001B180D20SP5C260 can work, but you can kill modem if not!!!!with hex editor you can only replace numbers, never overwrite with longer number!!!! Now I need firmware V200R001B180D20SP05C69 because this soft is with ussd codes sender. Just want to confirm that i used Kolos suggestion on a router with original FW V200R001B180D20SP05C397 and edited the string V200R001B236D30SP00C00 in the Bin file to match the Routers original FW of V200R001B180D20SP05C397. Even though the though the string i input was one char longer it worked.