Help needed. cfe.bin for DIR-895L router

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kernel-panic69
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PostPosted: Sun Aug 09, 2020 0:22    Post subject: Reply with quote
Usually a bad ground, however, if you are using 0.73 or newer PuTTY:
USB to TTL Tips - HOW TO FIX Garbage/Garbled PuTTY output

And no, not without removing all of the heatsinks and black covering that covers the board traces, it doesn't do me much good. Guess I need to peep FCCID resources to see if there are good pics.

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llFawkes17ll
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PostPosted: Sun Aug 09, 2020 0:34    Post subject: Reply with quote
Taking everything apart will be done once the new usb ttl cable comes in if that doesn't work.
I have been reading the thread about the 880L and came across the correct layout of that board according to multiple users. Do you think it's the same as the 895L?

Neozen wrote:
Hmm.. the pics were on Page 9, but they are gone now for some reason...

Anyway, the pin with the square (marked by arrow) is the Rx, (then space), then next pin is the 3.3v, then Gnd, then last is Tx.

Use only Rx, Gnd, and Tx ONLY!


https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1049680&highlight=#1049680
kernel-panic69
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PostPosted: Sun Aug 09, 2020 0:49    Post subject: Reply with quote
That may be a D-Link standard, worth trying. Seems to make sense.
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llFawkes17ll
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PostPosted: Sun Aug 09, 2020 1:00    Post subject: Reply with quote
kernel-panic69 wrote:
That may be a D-Link standard, worth trying. Seems to make sense.


Yep it does. It will be my first go once the new cable arrives. If it works then I'll update this thread so it can help someone in the future.
llFawkes17ll
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PostPosted: Tue Aug 18, 2020 21:24    Post subject: Reply with quote
So I got the new USB to serial cable. However, the router refuses to turn on if the cable is plugged in to the serial port. The router turns on if the cable is not plugged in to the serial power. Any ideas?
blkt
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PostPosted: Tue Aug 18, 2020 21:46    Post subject: Reply with quote
Which cable did you buy and is it TTL 3.3V? Which wires are being connected to which pins? Ground, TX, RX

For example, this is the cable I use.

https://www.amazon.com/dp/B07RBKCW3S

https://www.ebay.com/itm/124251758238
llFawkes17ll
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PostPosted: Tue Aug 18, 2020 21:53    Post subject: Reply with quote
blkt wrote:
Which cable did you buy and is it TTL 3.3V? Which wires are being connected to which pins? Ground, TX, RX

For example, this is the cable I use.

https://www.amazon.com/dp/B07RBKCW3S

https://www.ebay.com/itm/124251758238


I bought this cable https://www.ebay.ca/itm/USB-to-TTL-RS232-Serial-Converter-PL2303TA-Cable-for-Arduino-RPI-PIC-Blue-391-/254107182131

I have the black white and green cable plugged in. Now the router decided to turn in by nothing shows up on putty. Used the setting com3 115200 8 1 none.
blkt
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PostPosted: Tue Aug 18, 2020 22:05    Post subject: Reply with quote
Sometimes cheap adapters have the wires swapped, incorrectly color coded, or worse there's a short inside and the only way to determine is to open up the USB casing to verify the factory's soldering skills.

There are also counterfeit Prolific chips out there. Verify the Prolific drivers installed correctly, check the chip version too.

http://www.prolific.com.tw/US/ShowProduct.aspx?pcid=41&showlevel=0017-0037-0041

http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=225&pcid=41

http://www.prolific.com.tw/UserFiles/files/PL2303_CheckChipVersion_v1006.zip


Last edited by blkt on Tue Aug 18, 2020 22:21; edited 2 times in total
llFawkes17ll
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PostPosted: Tue Aug 18, 2020 22:11    Post subject: Reply with quote
blkt wrote:
Sometimes cheap adapters have the wires swapped, incorrectly color coded, or worse there's a short inside and the only way to determine is to open it up the USB casing to verify the factory's soldering skills.

There are also counterfeit prolific chips out there.

Verify the prolific drivers installed correctly.


I get this on the putty window if I move the cables that I have connected to the serial connection when the router is off. But nothing shows on the putty when I turn the router in.

Should I try a different software?



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blkt
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PostPosted: Tue Aug 18, 2020 22:22    Post subject: Reply with quote
Please re-read my post above; I added links too. PuTTY is not your problem.

The huge picture is garbage, please delete it.
llFawkes17ll
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PostPosted: Tue Aug 18, 2020 22:26    Post subject: Reply with quote
blkt wrote:
Please re-read my post above; I added links too. PuTTY is not your problem.

The huge picture is garbage, please delete it.


Everything looks connected



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blkt
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PostPosted: Tue Aug 18, 2020 22:38    Post subject: Reply with quote
On yours the TX is green and RX is white (my cable is the opposite).

The picture is blurry, but your black ground appears to be hanging on by a thread.
llFawkes17ll
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PostPosted: Tue Aug 18, 2020 22:38    Post subject: Reply with quote
blkt wrote:
Please re-read my post above; I added links too. PuTTY is not your problem.

The huge picture is garbage, please delete it.


The ground connection does seem to be holding on by a single strand of wire to the soldering pad on the usb part
kernel-panic69
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PostPosted: Tue Aug 18, 2020 22:50    Post subject: Reply with quote
May also wish to check this:

USB to TTL Tips - HOW TO FIX Garbage/Garbled PuTTY output

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DON'T use Chromium-based browsersRTFM/STFW - TL;DR is NOT an excuse. • Why Should I Care What Color the Bikeshed Is?
Please DO NOT PM me with questions; Ask in the forum.

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llFawkes17ll
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PostPosted: Tue Aug 18, 2020 22:56    Post subject: Reply with quote
kernel-panic69 wrote:
May also wish to check this:

USB to TTL Tips - HOW TO FIX Garbage/Garbled PuTTY output


Will be ordering another cable as this one looks suspect with the ground wire only having one string of cable connected to the soldering pad.
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