Cisco 819 lost everything on flash, but is still working ? please help

Question:

System image Cisco 3925 file is "flash:c800-universalk9-mz.SPA.152-4.M1.bin"

Cisco C819HG+7-K9 (revision 3.0) with 492620K/31667K bytes of memory.

cisco819#sh flash:
-#- --length-- -----date/time------ path
1     50833244 Feb 29 1984 00:01:00 +00:00 c800-universalk9-mz.SPA.152-4.M1.bin

209338368 bytes available (50835456 bytes used)

cisco819#

Cisco site sayes that latest image for My Router should be the one loaded right now...
It working, but unable to see certain things in cisco configuration proffesional...Fx Cellular 0
I tryed to downgrade, wich resultet in something like " Unsigned imaged found, Bailing out" then I had to do a tftpdnld, to recover the latest ios from Cisco
Stupid me, did not take a backup before it was to late
Anyway i did make it work again, but here comes my question

When i did the tftpdnld it told me that everythin was erassedm but i had no other way..
After a succesfull tftpdnld. i reboot and amazingly i had internet again

The strange thing is....I have a running-config if i ssh to it. but according to my flash: there is only my IOS.BIN
How is that working?
Anyone know where the latest working image can be found. because Cisco states the the one right now i the right..but still i cant see cellular 0 in CCP
But ita actualy the one making me able to write to this site, right now
BR Anders Bramsen

Answer:

When i did the tftpdnld it told me that everythin was erassedm but i had no other way..
After a succesfull tftpdnld. i reboot and amazingly i had internet again

This is because the configuration on Cisco routers is not stored in the FLASH memory but rather in a different place (and chip) called the NVRAM memory. This reason for this is historical - FLASH memory can be rewritten only a limited number of times and therefore it was not suitable to hold the startup-config file that can rewritten frequently. Your FLASH memory may really have been erased after the tftpdnld command but it did not damage your configuration stored in NVRAM. Try using the dir nvram: command to see its contents.

In order to download images for your Cisco router, you need to have a valid support contract. Cisco does not publish IOS images for free access. Cisco 3925 router 

For more info, http://switch.2329893.n4.nabble.com/3900-router-td14.html