restore factory

[TECH-JEFF]

Hi, we've migrated to a new firewall and we would like to make our old firewall (Cisco ASA 5520) as a backup device for our network. We're planning to backup the config and restore into factory settings. 

I saw a reset button at the back just like an ordinary home router but seems not working. Pressed it for 20-30 secs but no reaction. I simply plug a laptop via console cable to check if there will be some movements or progress. 

Thanks

Jeff

[TECH-JEFF]

I tried to typed in the command

write erase > reload

then it did the trick. After reboot, I can see under command

show flash: I can see a lot of stuff like

ciscoasa# sh flash:
--#-- --length-- -----date/time------ path
3 4096 Feb 03 2014 21:37:18 log
12 4096 Feb 03 2014 21:37:26 crypto_archive
15 4096 Feb 03 2014 21:37:30 coredumpinfo
16 59 Feb 03 2014 21:37:30 coredumpinfo/coredump.cfg
179 196 Feb 03 2014 21:37:30 upgrade_startup_errors_201402032137.log
180 200 Apr 04 2014 14:53:34 upgrade_startup_errors_201404041453.log
181 4096 Jan 01 1980 00:00:00 FSCK0000.REC
182 4096 Jan 01 1980 00:00:00 FSCK0001.REC
183 4096 Jan 01 1980 00:00:00 FSCK0002.REC
184 4096 Jan 01 1980 00:00:00 FSCK0003.REC
185 4096 Jan 01 1980 00:00:00 FSCK0004.REC
186 8192 Jan 01 1980 00:00:00 FSCK0005.REC
187 8192 Jan 01 1980 00:00:00 FSCK0006.REC
188 8192 Jan 01 1980 00:00:00 FSCK0007.REC
189 24576 Jan 01 1980 00:00:00 FSCK0008.REC
190 40960 Jan 01 1980 00:00:00 FSCK0009.REC
191 36864 Jan 01 1980 00:00:00 FSCK0010.REC
192 45056 Jan 01 1980 00:00:00 FSCK0011.REC
193 4096 Jan 01 1980 00:00:00 FSCK0012.REC
194 28672 Jan 01 1980 00:00:00 FSCK0013.REC
195 4096 Jan 01 1980 00:00:00 FSCK0014.REC
196 28672 Jan 01 1980 00:00:00 FSCK0015.REC
197 4096 Jan 01 1980 00:00:00 FSCK0016.REC
198 200 Apr 04 2014 14:56:00 upgrade_startup_errors_201404041456.log
199 200 Jul 08 2014 06:05:20 upgrade_startup_errors_201407080605.log
200 200 Jul 08 2014 06:13:00 upgrade_startup_errors_201407080613.log
201 200 Jul 08 2014 06:42:20 upgrade_startup_errors_201407080642.log
202 200 Jul 08 2014 06:52:32 upgrade_startup_errors_201407080652.log
203 200 Jul 08 2014 07:24:46 upgrade_startup_errors_201407080724.log
204 200 Jul 08 2014 07:36:24 upgrade_startup_errors_201407080736.log
205 28672 Jan 01 1980 00:00:00 FSCK0017.REC
206 4096 Jan 01 1980 00:00:00 FSCK0018.REC
207 200 Aug 14 2014 07:18:24 upgrade_startup_errors_201408140718.log
208 200 Aug 14 2014 07:38:54 upgrade_startup_errors_201408140738.log
209 200 Aug 14 2014 08:03:44 upgrade_startup_errors_201408140803.log
210 200 Aug 14 2014 08:12:48 upgrade_startup_errors_201408140812.log
211 200 Aug 14 2014 08:17:56 upgrade_startup_errors_201408140817.log
212 28672 Jan 01 1980 00:00:00 FSCK0019.REC
213 4096 Jan 01 1980 00:00:00 FSCK0020.REC
214 200 Aug 14 2014 08:20:54 upgrade_startup_errors_201408140820.log
215 200 Aug 14 2014 08:39:32 upgrade_startup_errors_201408140839.log
216 200 Aug 14 2014 08:53:36 upgrade_startup_errors_201408140853.log
217 200 Aug 18 2014 00:51:08 upgrade_startup_errors_201408180051.log
218 200 Aug 18 2014 00:55:28 upgrade_startup_errors_201408180055.log
219 15261696 Aug 18 2014 01:05:08 asa824-k8.bin
220 22824520 Dec 12 2014 23:40:14 asdm-715-100.bin
13 4096 Mar 26 2015 08:25:06 snmp
14 4 Apr 20 2015 17:43:54 snmp/single_vf
221 35468395 Apr 22 2015 02:59:00 anyconnect-win-3.1.05178-k9.pkg
222 188416 Jan 01 1980 00:00:00 FSCK0021.REC
223 28672 Jan 01 1980 00:00:00 FSCK0022.REC
224 4096 Jan 01 1980 00:00:00 FSCK0023.REC

Either I would like to upgrade or how do I know if there's an existing IOS installed? I mean, how do I load a new one then load it after reboot, I know that these info mean something, its just that I'm quite new to ASA. 

Thanks

Jeff