How to return the standard launch of CISCO?

Question

Cisco

Got new Cisco 2911/k9 hardware. After unsuccessful attempts to guess the default password. Changed config-register and password according to the note habrahabr.ru/post/122348 . Now, when rebooting, the password is only asked when trying to enter privileged mode.
And it loads very strangely:
Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(1)T1, RELEASE SOFTWARE (fc2)
Technical Support: www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems Inc.
Compiled Wed 12-Feb-14 04:57 by prod_rel_team
*Oct 7 12:20:23.907: %SNMP-5-COLDSTART: SNMP agent on host Router is undergoing a cold start
*Oct 7 12:20:24.519: %SYS-6-BOOTTIME: Time taken to reboot after reload = 150 seconds
*Oct 7 12:20:25.139: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0 /0, changed state to down
*Oct 7 12:20:25.139: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down
*Oct 7 12:20:25.139: %LINEPROTO-5 -UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down
*Oct 7 12:20:25.139: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down
*Oct 7 12:20:25.139: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down
*Oct 7 12:20:25.151: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF
* Oct 7 12:20:25.151: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF
*Oct 7 12:20:25.151: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF
*Oct 7 12:20:25.151: %CRYPTO-6 -GDOI_ON_OFF: GDOI is OFF
Router>
Router>
Router>
Router>enabl
Router>enable
Password:
Tell me how to reset everything

Answer 1

Did you change config-register back?
config-register 0x2102

Answer 2

The official documentation may help:
Password Recovery Procedure for the Cisco 2900 Integrated Services Router
www.cisco.com/c/en/us/support/docs/routers/2800-se...