1812Jの起動について

こんばんは

ciscoルーターの1812Jについてご質問をさせていただきます。
一度初期化をしようと

erase startup-config

を実行し

reload

を実行したところ、通常のユーザーモードには移行せず、ずっと再起動を繰り返すようになってしまいました。
以下その内容になります。どのように復旧すればよいかご教授いただけないでしょうか。その他必要な情報があればご指摘願います。

System Bootstrap, Version 12.3(8r)YH6, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2005 by cisco Systems, Inc.
C1800 platform with 131072 Kbytes of main memory with parity disabled

Readonly ROMMON initialized
program load complete, entry point: 0x80012000, size: 0xc0c0

Initializing ATA monitor library.......
program load complete, entry point: 0x80012000, size: 0xc0c0

Initializing ATA monitor library.......

program load complete, entry point: 0x80012000, size: 0x1c2dee4
Self decompressing the image : ################################################# ################################################################################ ################################################################################ ########################################################### [OK]

Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706



Cisco IOS Software, C181X Software (C181X-ADVIPSERVICESK9-M), Version 15.1(4)M12 a, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Tue 04-Oct-16 02:58 by prod_rel_team


This product contains ptographic features and is subject to United
States and local country laws governing import, export, transfer and
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pto/tool/stqrg.html" target="_blank">http://www.cisco.com/wwl/export/pto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Installed image archive
Cisco 1812-J (MPC8500) processor (revision 0x400) with 118784K/12288K bytes of m emory.
Processor board ID FHK101620S7, with hardware revision 0000

10 FastEthernet interfaces
1 ISDN Basic Rate interface
1 Virtual Private Network (VPN) Module
3368176K bytes of USB Flash usbflash1 (Read/Write)
31360K bytes of ATA CompactFlash (Read/Write)

SYSTEM INIT: INSUFFICIENT MEMORY TO BOOT THE IMAGE!



%Software-forced reload


11:46:14 UTC Mon Aug 20 2018: Unexpected exception to CPU: vector 1500, PC = 0x 8014655C, LR = 0x801464F4

-Traceback= 0x8014655Cz 0x801464F4z 0x824081C8z 0x832CFEA4z 0x822B3FE0z 0x822B41 40z 0x8229484Cz 0x82294964z 0x82294A08z 0x822955ECz 0x822C7888z 0x822D3600z 0x82 2BC978z 0x822DF98Cz 0x822DFF54z 0x816201A0z

CPU Register Context:
MSR = 0x02029220 CR = 0x28482042 CTR = 0x80D8AB60 XER = 0x00000000
R0 = 0x801464F4 R1 = 0x84F96FF0 R2 = 0xFFF97B88 R3 = 0x8465F1A8
R4 = 0x00000000 R5 = 0x00000000 R6 = 0x83F70000 R7 = 0x83450000
R8 = 0x02029220 R9 = 0x84100000 R10 = 0x00000000 R11 = 0x00000000
R12 = 0x24482048 R13 = 0xFFF99420 R14 = 0x83F80000 R15 = 0x83C21A60
R16 = 0x843C0000 R17 = 0x84F97044 R18 = 0x843C0000 R19 = 0x843C0000
R20 = 0x00000000 R21 = 0x00000000 R22 = 0x84ED0000 R23 = 0x00000000
R24 = 0x00000000 R25 = 0x00000000 R26 = 0x00002814 R27 = 0x00000000
R28 = 0x822B3FDC R29 = 0x84EB9CE0 R30 = 0x83F80000 R31 = 0x00000000

TEXT_START : 0x8001211C
DATA_START : 0x832D5000Free space check for flash:crashinfo_20180820-114614-UTC failed (0/7891)
Free space check for flash:crashinfo_20180820-114614-UTC failed (0/7891)
Free space check for flash:crashinfo_20180820-114614-UTC failed (0/7891)
Free space check for flash:crashinfo_20180820-114614-UTC failed (0/8192)
Free space check for flash:crashinfo_20180820-114614-UTC failed (0/8192)
Free space check for flash:crashinfo_20180820-114614-UTC failed (0/8192)

Writing crashinfo to flash:crashinfo_20180820-114624-UTC
No fault history 0x0

=== Flushing messages (11:46:25 UTC Mon Aug 20 2018) ===

Queued messages:
*Aug 20 11:46:25.863: %SYS-3-LOGGER_FLUSHING: System pausing to ensure console d ebugging output.

*Aug 20 11:45:49.051: %IFMGR-7-NO_IFINDEX_FILE: Unable to open nvram:/ifIndex-ta ble No such file or directory
*Aug 20 11:45:50.503: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State change d to: Initialized
*Aug 20 11:45:51.023: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State change d to: Enabled
*Aug 20 11:46:09.067: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to up
*Aug 20 11:46:09.067: %LINK-3-UPDOWN: Interface FastEthernet1, changed state to up
*Aug 20 11:46:09.067: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0, chan ged state to down
*Aug 20 11:46:09.067: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, ch anged state to down
*Aug 20 11:46:09.067: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:2, ch anged state to down
*Aug 20 11:46:09.983: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, cha nged state to down
*Aug 20 11:46:10.067: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern et0, changed state to down
*Aug 20 11:46:10.067: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern et1, changed state to down
*Aug 20 11:46:11.059: USB init complete.
*Aug 20 11:46:11.067: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to down
*Aug 20 11:46:11.067: %LINK-3-UPDOWN: Interface FastEthernet1, changed state to down
*Aug 20 11:46:11.211: %USBFLASH-5-CHANGE: usbflash1 has been inserted!
*Aug 20 11:46:12.199: %USBFLASH-4-FORMAT: usbflash1 contains unexpected values i n partition table or boot sector. Device needs formatting before use!
*Aug 20 11:46:14.003: %LINK-5-CHANGED: Interface BRI0, changed state to administ ratively down
*Aug 20 11:46:14.535: %SYS-2-MALLOCFAIL: Memory allocation of 10260 bytes failed from 0x822B3FDC, alignment 0
Pool: Processor Free: 36 Cause: Not enough free memory
Alternate Pool: I/O Free: 8392 Cause: Not enough free memory
-Process= "Init", ipl= 0, pid= 3
-Traceback= 80D90C80z 823E5DB4z 824081C8z 832CFEA4z 822B3FE0z 822B4140z 8229484C z 82294964z 82294A08z 822955ECz 822C7888z 822D3600z 822BC978z 822DF98Cz 822DFF54 z 816201A0z
*Aug 20 11:46:14.931: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, chan ged state to up
*Aug 20 11:46:15.863: %LINK-5-CHANGED: Interface FastEthernet1, changed state to administratively dow
*** System received a Software forced crash ***
signal= 0x17, code= 0x1500, context= 0x8459af58
PC = 0x8014655c, Vector = 0x1500, SP = 0x84f96ff0

残念ながらメモリ不足ですね…
引用：そもそもIOS15系を起動しようとしてるのにRAMが128MBでは無理があるので、増設されるのが良いかと思います。できれば256MBを…

今純正を手に入れるのは大変かと思いますが、互換品を探せば少しは安く上がるかも知れません。

ご回答ありがとうございます。
crashinfoがたまってしまったためかと思っていたため、ROMモニタ状態でメモリーをフォーマットしなければならないと考えていました。
起動するIOSによって必要なメモリが異なるんですね。

追って１点お伺いしたいのです。
現状ROMモニタ状態でしか操作できないのですが、IOSのダウングレードは可能でしょうか。

ここが参考になるかと思います。
https://www.cisco.com/c/ja_jp/support/docs/routers/10000-series-routers/23233-sw-upgrade-highendrouters-23233.html