Problems while upgrading inter.broker.protocol.version from '2.3-IV1' to '3.5'

[AlexChulkin]

Hello all. I have the Confluentinc Kafka single test broker deployed onto OCP4. Task is to upgrade from the ConfluentInc cp-enterprise-kafka v5.5.1(Kavka v2.3.0-IV1) to cp-kafka v7.5.1(Kafka v3.5.0).
Upgrading in accordance to https://kafka.apache.org/documentation/#upgrade_3_5_0 .

Initial config(Kafka is up and running):

confluentinc image: [docker-public-virtual.docker.devstack.vwgroup.com/confluentinc/cp-kafka](http://docker-public-virtual.docker.devstack.vwgroup.com/confluentinc/cp-kafka)
confluentinc imageTag: 7.5.1
server property [inter.broker](http://inter.broker/).protocol.version: "2.3-IV1"
log.message.format.version: "2.3-IV1"

Updated config(error, see below):

 confluentinc image: [s](http://docker-public-virtual.docker.devstack.vwgroup.com/confluentinc/cp-kafka)ame
confluentinc imageTag: same
server property [inter.broker](http://inter.broker/).protocol.version: "3.5"
log.message.format.version: "2.3-IV1"

Possible issue: Exiting Kafka due to fatal exception
org.apache.kafka.common.config.ConfigException: Invalid value 3.5 for configuration inter.broker.protocol.version: Version 3.5 is not a valid version`
Any help would be highly appreciated. Please let me know if one needs more detailed configuration, etc.