This tutorial refers to the Alpine Wireless Forum related posts
hg255d TTL socket definition (v+ 3.3V voltage, must not be answered)
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TX NULL v+ GND RX
one, the use of the thinga cable lineUSB turn TTL line oneSECURECRT terminal emulation programof course, the router hg255d body and the power adapter are also indispensable
Second, the connection TTL linethe TX, RX, GND on the router PCB board are connected to the TX, RX, GND pins of the USBTTL (USB to serial port) respectively .Unplug all network cables from the router WAN and LAN ports
third, the computer preset (the author uses the XP system)USB to TTL to the computer, install the Usbttl driver, choose the right COM port (in Device Manager to see the number of COM ports, the author here is COM9). change the computer's network card address to a static IP address (the author is set to 192.168.1.100)the rate at which the SECURECRT COM port is set is 57600 bits per second (the author uses securecrt here). Setup securecrt (protocol:serrial port:com9 Baud rate:57600 Data bits:8 parity:none Stop bits:1)the Flow control option Dtr/dsr,rts/cts,xon/xoff no tick (the COM port selects the corresponding number according to the Device Manager). P.S. The latest u-boot baud rate is 115200, which is httpd, not tftpd. It is recommended to use the U-boot in the annex I provided to compare the insurance points.
Click "Connect" to complete the SECURECRT COM port connection settings, if the connection is correct, there will be a green tick before the window, such as:you can turn on the power of the route, as shown on the SECURECRT to indicate that the connection is correct and power off. If not, swap the RX and TX two wires. put the relevant files (U-boot, EEPROM and OpenWrt firmware), and TFTPD32 in the same folder, run TFTPD32 (do not set anything).
Four, start the brush machine-brush into the u-boot (make sure the TTL line is correctly connected)
(i) in the SECURECRT, turn on the hg255d power supply when it appearsPlease choose the operation:1:load system code to SDRAM via TFTP.2:load System code then write to Flash via TFTP.3:boot system code via Flash (default).4:enter boot command line interface.9:load Boot Loader code then write to Flash via TFTP.
(b) Immediately after 4 appears as follows (cannot press 9, press 9 to update u-boot 100% to brick--the number key on the keyboard 4)4:system Enter Boot Command line Interface.u-boot 1.1.3 (Nov 2012-12:00:15Main_loop !RT3052 #such as:P.S: If you are not sure when to press 4 can be connected to the power immediately press the number key 4, SECURECRT can not need to shut.
(c) Set the network address of the TFTP service and upload the file to memoryinput Commandsetenv ServerIP 192.168.1.100Enterthen entertftpboot 0x80100000 Tftpd-uboot.binEnterThe securecrt window returns information as follows:
(four) SECURECRT display 2 arp Timeout check plug in the network cable, the network cable into the router's LAN port (yellow interface), any mouth can be. Note: If you are not prompted to successfully download to the problem, do not continue with the following operation. such as full TFTP upload, after netbootfilexfersize= 00023874) (00023874 is tftpd-uboot.bin file size 16 binary value, the value of the other U-boot file may be different)
(v) Unlock flash protectioninput protect off all
EnterThe return information is as follows:
(Six) Erase U-bootinputErase 0xbf000000 0xbf03ffffEnterThe return information is as follows:
(Seven) Write U-bootinputcp.b 0x80100000 0xbf000000 0x40000EnterThe return information is as follows: (Eight) Backup EEPROM (This step is likely to make the machine brick, the main role of this step is to back up the MAC address and wireless information)cp.b 0xbffa0000 0x80100000 0x20000MD 0x80100000Erase 0xbf060000 0xbf07ffffcp.b 0x80100000 0xbf060000 0x20000MD 0xbf060000 Important NOTE: If you are afraid of bricks, do not do this step above, you can use TFTP to brush into the fifth stride of the EEPROM, the back can be updated lintel EEPROM.
(ix) After brushing the system will restart itself, if not restarted, press CTRL + C to restart the machine. (10) go here u-boot brush complete, close Tftpd32.exe Here I brush is TFTPD version of the Uboot, this method can also brush the original uboot and httpd version of the Uboot. Note: If you want to brush the EEPROM to first brush tftfd version of the Uboot, and then brush the EEPROM. After brushing the httpd version is not able to brush EEPROM, because the EEPROM is required TFTP brush.
Five, " This step will weaken the wireless-- does not recommend the operation, jumps directly to "six", the original EEPROM has the checksum limit, many third party firmware cannot brush, the HyperTerminal/securecrt window has the prompt flash limit, You can choose to first brush into the Hg255d-eeprom.bin (this is a third-party cracked version of the EEPROM) to crack, and then brush Dd-wrt/openwrt/tomato and other third-party firmware.
(a) modify the MAC address in the Eeprom.bin of the third partyOpen Eeprom.bin with Winhex, and navigate to 0x00000020-8, such as:
(ii) brush into Eeprom.bincompared to u-boot, it is much simpler to brush the EEPROM. First put hg255d power off, run TFTP software, select Eeprom.bin, press and hold the reset key is not loose power, 5 seconds after the type will enter the brush mode, click on the TFTP "update firmware", and so the gray circle into green can be. such as:
VI. UPDATE Router firmware (Openwrt pandorabox)first will hg255d power off, run TFTP software, select the firmware to be brushed, press and hold the reset key to power, 5 seconds after the type will enter the brush mode, click on the TFTP "update firmware", and so the gray circle into green can be, here do not be too anxious, it may take 3-5 minutes, You can ping 192.168.1.1-t until you have a ping value, so that's OK.
p.s-1: Dd-wrt firmware is similar to the brush-in method. p.s-2: Above, this tutorial is for the author to practice finishing.
Tools and firmware downloads:: Link: https://pan.baidu.com/s/1eSKMicE Password: 8k3m
HG255D Telecom Original Brush machine combat finishing, both hg255d Brush Uboot, Openwrt
