That screen u mentioned can possibly be used as an alternate download mode screen. If not, then a Jig is all u need. See my signature link below for links on how to make one or where to buy one.
And also see this thread for some very good info... Captivate PC Connection Issues, Download Mode and Recovery Mode Help :good:
^
Soft brick...Jig will work. (i take it u can't get into download through regular button combo/insert usb etc.) Check my signature link below for links on how to make one and or where to buy one.
Sent from my SGH-I897 using xda premium
^ Asylum1621,
Heimdall One Click for Stock GB 2.3.5 i897ucKK4 is here.
[Utility] KK4 Easy Root by Red_81 is here. And this Utility will also give you KK4 Corn Kernel version 7.0A that has CWM Recovery included, so that you can proceed with flashin Dev Roms if you want.
Also, another thread that will be of some help... Captivate - PC Connection Issues, Download Mode and Recovery Mode Help
See this thread about Captivate - PC Connection Issues, etc. http://xdaforums.com/showthread.php?p=33227541
Sent from my SAMSUNG-SGH-I747 using xda premium
DOWNLOAD INSTRUCTIONS:
-Perform a factory reset on your phone. (Optional, recommended)
-Download any OneClickOdin package to your desktop.
-Be sure you have the Captivate drivers installed on your computer.
-Right click and Run as admistrator the Odin.
-Remove your sim card and external sdcard from you phone.
-Put your phone into download mode. (Press and hold both volume buttons and insert USB cable into phone)
-Wait for Odin to recognize your device. Yellow com port will light up.
-Click the big Start Button.
-Sit back and watch. This should only take between 2 or 3 minutes to complete.
-When the process is finished and your phone begins to reboot and you see the at&t screen you may go ahead and unplug the micro usb from your phone.
TIP:
Once you're on AT&T GB Bootloaders, I would advice you to use bootloader free package always in future. So far AT&T GB bootloaders have been backward compatible with all I897 (even I9000) Froyo/Eclairs ROMs. I have used I9000 based ROMs with AT&T GB BLs. Someone in CM7 thread claimed to use AT&T GB bootloaders with CM7 without any problem.
PS: More than half of the modems listed here, I have collected from here and there, don't even remember from where. However I remember there was one website where I found most of them. Rest are simply packed by me using same zip script from others. I am just putting up all Stock Captivate stuff at one place.
EDIT: Found the original thread by Oxicottin. Most the modems here are done by him. Check out his website for location wise data for best modems. Check this thread for a get around on RAT selection restrictions on i897 modems.
Also, check this thread for more I9000 based modems and modem dance. (I9000 modems requires I9000 based ROM and reoriented kernels.)