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Cisco Bug: CSCur49750 - 78XX phone not mounting mnt/flash2 even after upgrading to 10-2-1-12ES1

Last Modified

Jan 23, 2019

Products (33)

  • Cisco IP Phone 7800 Series
  • Cisco Unified IP Phone 7945G
  • Cisco IP Phone 8851
  • Cisco IP Phone 7841
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 6961
  • Cisco Unified IP Phone 6941
  • Cisco IP Phone 7821
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Known Affected Releases


Description (partial)

Customer has upgraded the ip phone 7841 firmware from sip78xx.10-1-1SR2-1 to sip78XX.10-2-1ES1, that contains fix for CSCuq96598. The firmware sip78XX.10-2-1ES1 contains fix for mounting the missing /mnt/flash2 which inturn helps in fixing the XML Error. 

But even after the upgrade, IP Phone contains only /mnt/flash. It is not mounting /mnt/flash2.

Many Customers were able to bring back the missing /mnt/flash2 partition on the ip phone by upgrading to sip78XX.10-2-1ES1. But few Customers are still not getting the /mnt/flash2 even after upgrading to ES1.

78xx ip phone has only /mnt/flash (Missing /mnt/flash2 ) even after upgrading to sip78XX.10-2-1ES1 firmware.
We can execute a 'show disk' command by using the SSH access to the ip phone to verify the partitions.

While analyzing this issue, DE found the below errors in the console logs.

0058 ERR 08:27:01.473517 kernel: [ 1.979843] UBI error: ubi_read_volume_table: the layout volume was not found
0059 ERR 08:27:01.473585 kernel: [ 1.987447] UBI error: ubi_init: cannot attach mtd9
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