Author Topic: Nspire Serial boot 2 downgrade?  (Read 2807 times)

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Offline njaddison

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Nspire Serial boot 2 downgrade?
« on: February 10, 2014, 07:27:14 pm »
I recently got a TTL-USB adapter and I want to use it to downgrade my nspire's boot 2. I have a hardware revision I CX CAS, but my problem is getting the pins to stay and keeping the serial port from snapping shut while I attempt to connect the proper pins. I've been trying for hours, using tape to keep the pins down, but they continue to move around and I can't get them to stay. I haven't connected it to the computer in fear of one of the pins moving and messing up my calc. Could you please give me a tip on how to keep the pins in place and how to send the boot 2 to the nspire? I also have no knowledge of sending files through RS232. My operating system is Ubuntu Linux.
Thanks,
njaddison
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Offline Springyboy

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Re: Nspire Serial boot 2 downgrade?
« Reply #1 on: February 10, 2014, 09:54:12 pm »
Hi njaddison,

Can I just confirm that your boot2 is 3.2.4. Just go to settings about to see your boot2.

If it is, then use this guide http://ourl.ca/20292/370557 to do the rs232.

I would suggest using PuTTY to do the flashing. Here is the link for it http://www.chiark.greenend.org.uk/~sgtatham/putty/

I was unsuccessful with the rs232 on my cx cas, but just ensure that those wires stick and it should work.

Offline njaddison

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Re: Nspire Serial boot 2 downgrade?
« Reply #2 on: February 11, 2014, 11:09:16 am »
My boot 2 is 3.2.4 and I need to downgrade it to 3.1.0 to use nlaunch. My goal is to have my cx ndlessed.
My jumper cables are the stiff kind with metal prongs on the end, and they won't go next to each other because of a black plastic thing on them (don't know what it's called).
Does anybody know where to find some flexible serial cables?
Like the kind in this picture: http://tiplanet.org/forum/gallery/image.php?album_id=4&image_id=41&view=no_count
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Offline njaddison

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Re: Nspire Serial boot 2 downgrade?
« Reply #3 on: February 13, 2014, 03:19:26 pm »
I apologize for double posting, but what type of adhesive should I use for the connectors? It needs to be one that:
- can be easily removed
- will not damage my calc
- is not messy or sticky
- is not hard to use or annoying

EDIT:
I have attached a picture
« Last Edit: February 13, 2014, 03:21:40 pm by njaddison »
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Offline njaddison

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Re: Nspire Serial boot 2 downgrade?
« Reply #4 on: February 13, 2014, 06:18:05 pm »
Finally got the connections to stay put.
Now I am sending the file. Images attatched, tell me if I am doing this right.
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Offline floris497

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Re: Nspire Serial boot 2 downgrade?
« Reply #5 on: February 14, 2014, 06:12:22 am »
put the wires under the plastic sliding cover, it is little hard to get it there but it is possible.

Offline njaddison

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Re: Nspire Serial boot 2 downgrade?
« Reply #6 on: February 14, 2014, 04:12:12 pm »
OK, I attempted sending the file through the xmodem protocol, but my serial program keeps saying "Retry 0: Got 01 for sector ACK." This is very annoying, but I don't want to give up yet. I don't think that ndless 3.2 will be coming anytime soon, so I really want to downgrade my boot2 and use nlaunch.

EDIT: It also says "Retry 0: Timeout on sector ACK"
It's not sending at all. I can only get it to send raw files (no protocol).
« Last Edit: February 14, 2014, 04:15:24 pm by njaddison »
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