The best replacement for 4.2 is 4.1.

The best alternatives to 4.2 are rated as following:
★★★★★  4.1
★★★★★  4.3
★★★  4.0
★★★  4.4
★★  4.4 android
★★  6.2
★★  4.3 jelly bean
★★  4.0 jeep wrangler
★★  4.2.1
★★  4.1.2
★★  4.3 s4
★★  2.7t
★  3.0 patrol
★  3.1.3
★  3.0t
★  4.0 android
★  4.1 iphone
★  2.7
★  ios 6
  windows phone 8
  4.1 ios
  4.1 3g
  4.1 android
  bmw 540
  4.1 iphone 3g
  4.1.2 android
  ios 7
  chevy 4.3
  4.1 wii

Your alternative for 4.2 is not listed? Suggest!
Speaking about 4.2, one probably shouldn't forget about ios 5.1.

Other search terms related to 4.2 and their ratings are:
★★★★★ ios 5.1
★ cydia
★ iphone 3g
3g
limera1n
You have in mind a companion for 4.2 and it is not yet here? Propose!



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4.2
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