Tagging port on Default Vlan1 Switch HP V1905

[moh24100]

Hello everyone,

I need your help to tagged port on valn 1 on Switch 1905 if this possible , i had tried to do it from GUI ,but i guess not supported

i got following message(Valn1 cannot modifed) , also had tried to do this from CLI but there is very less command in this switch.why i am trying to do this configuration ?because

when connected the mentiond switch to my network i got this message on Core switch

"PVID mismatch on port 1/C6(VID unknown)with peer device port Ethernet0/25(VID 1)(1445)"
PVID mismatch on port 2/C6(VID unknown)with peer device port Ethernet0/26(VID 1)(1444)

Please advise

Thanks in advance

[moh24100]

any advise please ?