[Captivate Q&A, Help & Troubleshooting] aequinoxk:
Update 2:

Using Heimdall I flashed everything but the modem. I was able to boot stock Gingerbread 2.3.6, but (I suppose not unexpectedly) I had no network connection (SIM card is in).

I also got **** sorted out on my computer and was able to get Odin to detect my Cappy, but any Odin flashes hangs on either "Setup Connection.." (Odin 1.7) or "Set PIT file.." (One-Click Downloader).

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Edit/Update:

Ran Heimdall anyways and it hung on modem.bin again. Here's the report:

Heimdall v1.3.1, Copyright (c) 2010-2011, Benjamin Dobell, Glass Echidna
[url]http://www.glassechidna.com.au[/url]

This software is provided free of charge. Copying and redistribution is
encouraged.

If you appreciate this software and you would like to support future
development please consider donating:
[url]http://www.glassechidna.com.au/donate/[/url]

Initialising connection...
Detecting device...
Claiming interface...
Setting up interface...

Checking if protocol is initialised...
Protocol is not initialised.
Initialising protocol...
Handshaking with Loke...

Beginning session...
Session begun with device of type: 0

Uploading PIT
PIT upload successful
Uploading KERNEL
0%
2%
4%
6%
9%
11%
13%
16%
18%
20%
22%
25%
27%
29%
32%
34%
36%
38%
41%
43%
45%
48%
50%
52%
54%
57%
59%
61%
64%
66%
68%
70%
73%
75%
77%
80%
82%
84%
86%
89%
91%
93%
96%
98%
100%

KERNEL upload successful
Uploading MODEM
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
11%
12%
13%
14%
15%
16%
17%
18%
19%
20%
21%
22%
23%
25%
26%
27%
28%
29%
30%
31%
32%
33%
34%
35%
36%
37%
38%
39%
40%
41%
42%
43%
44%
45%
46%
47%
48%
50%
51%
52%
53%
54%
55%
56%
57%
58%
59%
60%
61%
62%
63%
64%
65%
66%
67%
68%
69%
70%
71%
72%
73%
75%
76%
77%
78%
79%
80%
81%
82%
83%
84%
85%
86%
87%
88%
89%
90%
91%
92%
93%
94%
95%
96%
97%
98%
100%

And after that, it's just stuck.

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Original Message:

I'll keep it short.

A few weeks back I successfully flashed my Captivate for the first time to Serendipity VII. Upon recently trying to flash it back to stock, I managed to bootloop my phone. After that I tried quite a few different things, ending on Odin hanging on modem.bin when trying to re-flash back to stock. I tried flashing just the modem.bin with Heimdall and managed to get it to 100% - after which it hanged for ~30 minutes. Decided to pull the plug and see if it worked (my first time using Heimdall so I didn't know what the final readout was supposed to look like) and I coulnd't boot the phone for the next few hours (not regular boot nor into Download mode). Finally I got it to boot into download mode, and now while my computer recognizes the phone, Odin does not.

On the upside, Heimdall seems to recognize the device. I really don't want to screw up my phone any more than it already is, so which firmware from this thread should I use?

Or, is the modem.bin situation a serious problem? I'd love to use Odin (for which I found several users experiencing similar problems) but none of the answers seem to involve Heimdall. Is there anything else I should be doing?

Thanks for reading.. all help is genuinely appreciated.